diff --git a/man/mastorss.1.adoc b/man/mastorss.1.adoc
index db32774..40158b3 100644
--- a/man/mastorss.1.adoc
+++ b/man/mastorss.1.adoc
@@ -2,7 +2,7 @@
 :doctype:       manpage
 :Author:        tastytea
 :Email:         tastytea@tastytea.de
-:Date:          2019-12-25
+:Date:          2019-12-28
 :Revision:      0.0.0
 :man source:    mastorss
 :man manual:    General Commands Manual
@@ -157,15 +157,16 @@ proxy support yet, sorry.
 == ERROR CODES
 
 [cols=">,<"]
-|===========================================================
+|===============================================================================
 | Code | Explanation
 
 |    1 | No profile specified.
 |    2 | Network error.
 |    3 | File error.
 |    4 | Mastodon API error.
+|    5 | JSON error, most likely the file is wrongly formatted.
 |    9 | Unknown error.
-|===========================================================
+|===============================================================================
 
 == DEBUGGING
 
diff --git a/src/config.cpp b/src/config.cpp
index a2d9e35..54bea9d 100644
--- a/src/config.cpp
+++ b/src/config.cpp
@@ -74,8 +74,8 @@ std::ostream &operator <<(std::ostream &out, const ProfileData &data)
     return out;
 }
 
-Config::Config(string profile)
-    :_profile{move(profile)}
+Config::Config(string profile_name)
+    : profile{move(profile_name)}
 {
     const fs::path filename = get_filename();
     BOOST_LOG_TRIVIAL(debug) << "Config filename is: " << filename;
@@ -94,7 +94,7 @@ Config::Config(string profile)
     }
 }
 
-fs::path Config::get_filename() const
+fs::path Config::get_config_dir() const
 {
     char *envdir = getenv("XDG_CONFIG_HOME");
     fs::path dir;
@@ -122,7 +122,12 @@ fs::path Config::get_filename() const
         BOOST_LOG_TRIVIAL(debug) << "Created config dir: " << dir;
     }
 
-    return dir /= "config-" + _profile + ".json";
+    return dir;
+}
+
+fs::path Config::get_filename() const
+{
+    return get_config_dir() /= "config-" + profile + ".json";
 }
 
 void Config::generate()
@@ -131,39 +136,39 @@ void Config::generate()
 
     cout << "Instance (domain): ";
     getline(cin, line);
-    data.instance = line;
+    profiledata.instance = line;
 
-    data.access_token = get_access_token(line);
+    profiledata.access_token = get_access_token(line);
 
     cout << "URL of the feed: ";
     std::getline(cin, line);
-    data.feedurl = line;
+    profiledata.feedurl = line;
 
     cout << "Post only titles? [y/n]: ";
     std::getline(cin, line);
     if (line[0] == 'y')
     {
-        data.titles_only = true;
+        profiledata.titles_only = true;
     }
     else
     {
-        data.titles_only = false;
+        profiledata.titles_only = false;
     }
 
     cout << "Post titles as cw? [y/n]: ";
     std::getline(cin, line);
     if (line[0] == 'y')
     {
-        data.titles_as_cw = true;
+        profiledata.titles_as_cw = true;
     }
     else
     {
-        data.titles_as_cw = false;
+        profiledata.titles_as_cw = false;
     }
 
     cout << "Append this string to each post: ";
     std::getline(cin, line);
-    data.append = line;
+    profiledata.append = line;
 
     cout << "Interval between posts in seconds [30]: ";
     std::getline(cin, line);
@@ -171,7 +176,7 @@ void Config::generate()
     {
         line = "30";
     }
-    data.interval = static_cast<uint32_t>(stoul(line));
+    profiledata.interval = static_cast<uint32_t>(stoul(line));
 
     cout << "Maximum size of posts [500]: ";
     std::getline(cin, line);
@@ -179,7 +184,7 @@ void Config::generate()
     {
         line = "500";
     }
-    data.max_size = stoul(line);
+    profiledata.max_size = stoul(line);
 
     BOOST_LOG_TRIVIAL(debug) << "Generated configuration.";
     write();
@@ -220,48 +225,48 @@ string Config::get_access_token(const string &instance) const
 
 void Config::parse()
 {
-    data.access_token = _json[_profile]["access_token"].asString();
-    data.append = _json[_profile]["append"].asString();
-    data.feedurl = _json[_profile]["feedurl"].asString();
-    for (const auto &fix : _json[_profile]["fixes"])
+    profiledata.access_token = _json[profile]["access_token"].asString();
+    profiledata.append = _json[profile]["append"].asString();
+    profiledata.feedurl = _json[profile]["feedurl"].asString();
+    for (const auto &fix : _json[profile]["fixes"])
     {
-        data.fixes.push_back(fix.asString());
+        profiledata.fixes.push_back(fix.asString());
     }
-    data.instance = _json[_profile]["instance"].asString();
-    if (!_json[_profile]["interval"].isNull())
+    profiledata.instance = _json[profile]["instance"].asString();
+    if (!_json[profile]["interval"].isNull())
     {
-        data.interval =
-            static_cast<uint32_t>(_json[_profile]["interval"].asUInt64());
+        profiledata.interval =
+            static_cast<uint32_t>(_json[profile]["interval"].asUInt64());
     }
-    data.last_guid = _json[_profile]["last_guid"].asString();
-    if (!_json[_profile]["max_size"].isNull())
+    profiledata.last_guid = _json[profile]["last_guid"].asString();
+    if (!_json[profile]["max_size"].isNull())
     {
-        data.max_size = _json[_profile]["max_size"].asUInt64();
+        profiledata.max_size = _json[profile]["max_size"].asUInt64();
     }
-    for (const auto &skip : _json[_profile]["skip"])
+    for (const auto &skip : _json[profile]["skip"])
     {
-        data.skip.push_back(skip.asString());
+        profiledata.skip.push_back(skip.asString());
     }
-    data.titles_as_cw = _json[_profile]["titles_as_cw"].asBool();
-    data.titles_only = _json[_profile]["titles_only"].asBool();
+    profiledata.titles_as_cw = _json[profile]["titles_as_cw"].asBool();
+    profiledata.titles_only = _json[profile]["titles_only"].asBool();
 
-    BOOST_LOG_TRIVIAL(debug) << "Read config: " << data;
+    BOOST_LOG_TRIVIAL(debug) << "Read config: " << profiledata;
 }
 
 void Config::write()
 {
-    _json[_profile]["access_token"] = data.access_token;
-    _json[_profile]["append"] = data.append;
-    _json[_profile]["feedurl"] = data.feedurl;
+    _json[profile]["access_token"] = profiledata.access_token;
+    _json[profile]["append"] = profiledata.append;
+    _json[profile]["feedurl"] = profiledata.feedurl;
     // Leave fixes.
-    _json[_profile]["instance"] = data.instance;
-    _json[_profile]["interval"] = data.interval;
-    _json[_profile]["last_guid"] = data.last_guid;
-    _json[_profile]["max_size"]
-        = static_cast<Json::Value::UInt64>(data.max_size);
+    _json[profile]["instance"] = profiledata.instance;
+    _json[profile]["interval"] = profiledata.interval;
+    _json[profile]["last_guid"] = profiledata.last_guid;
+    _json[profile]["max_size"]
+        = static_cast<Json::Value::UInt64>(profiledata.max_size);
     // Leave skip.
-    _json[_profile]["titles_as_cw"] = data.titles_as_cw;
-    _json[_profile]["titles_only"] = data.titles_only;
+    _json[profile]["titles_as_cw"] = profiledata.titles_as_cw;
+    _json[profile]["titles_only"] = profiledata.titles_only;
 
     ofstream file{get_filename().c_str()};
     if (file.good())
diff --git a/src/config.hpp b/src/config.hpp
index 58fd99d..91d10f9 100644
--- a/src/config.hpp
+++ b/src/config.hpp
@@ -18,7 +18,7 @@
 #define MASTORSS_CONFIG_HPP
 
 #include <boost/filesystem.hpp>
-#include <jsoncpp/json/json.h>
+#include <json/json.h>
 
 #include <cstdint>
 #include <string>
@@ -64,14 +64,16 @@ struct ProfileData
 class Config
 {
 public:
-    explicit Config(string profile);
+    explicit Config(string profile_name);
 
-    ProfileData data;
+    const string profile;
+    ProfileData profiledata;
 
     void write();
+    [[nodiscard]]
+    fs::path get_config_dir() const;
 
 private:
-    const string _profile;
     Json::Value _json;
 
     [[nodiscard]]
diff --git a/src/document.cpp b/src/document.cpp
index e91c908..22fb81a 100644
--- a/src/document.cpp
+++ b/src/document.cpp
@@ -21,9 +21,12 @@
 #include <boost/log/trivial.hpp>
 #include <boost/property_tree/xml_parser.hpp>
 #include <boost/regex.hpp>
+#include <json/json.h>
 #include <mastodon-cpp/mastodon-cpp.hpp>
 #include <restclient-cpp/connection.h>
 
+#include <algorithm>
+#include <fstream>
 #include <list>
 #include <sstream>
 #include <string>
@@ -33,8 +36,11 @@ namespace mastorss
 {
 using boost::regex;
 using boost::regex_replace;
+using std::transform;
+using std::ifstream;
 using std::list;
 using std::istringstream;
+using std::stringstream;
 using std::string;
 using std::move;
 
@@ -45,7 +51,7 @@ bool operator !=(const Item &a, const Item &b)
 
 Document::Document(Config &cfg)
     : _cfg{cfg}
-    , _profile{cfg.data}
+    , _profiledata{_cfg.profiledata}
 {
     RestClient::init();
 
@@ -70,20 +76,20 @@ void Document::download(const string &uri)
     case 200:
     {
         _raw_doc = response.body;
-        BOOST_LOG_TRIVIAL(debug) << "Downloaded feed: " << _profile.feedurl;
+        BOOST_LOG_TRIVIAL(debug) << "Downloaded feed: " << _profiledata.feedurl;
         break;
     }
     case 301:
     case 308:
     {
-        _profile.feedurl = extract_location(response.headers);
-        if (_profile.feedurl.empty())
+        _profiledata.feedurl = extract_location(response.headers);
+        if (_profiledata.feedurl.empty())
         {
             throw HTTPException{response.code};
         }
 
         BOOST_LOG_TRIVIAL(debug) << "Feed has new location (permanent): "
-                                 << _profile.feedurl;
+                                 << _profiledata.feedurl;
         _cfg.write();
         download();
         break;
@@ -99,7 +105,7 @@ void Document::download(const string &uri)
         }
 
         BOOST_LOG_TRIVIAL(debug) << "Feed has new location (temporary): "
-                                 << _profile.feedurl;
+                                 << _profiledata.feedurl;
         download(newuri);
         break;
     }
@@ -116,7 +122,7 @@ void Document::download(const string &uri)
 
 void Document::download()
 {
-    download(_profile.feedurl);
+    download(_profiledata.feedurl);
 }
 
 void Document::parse()
@@ -145,14 +151,14 @@ void Document::parse_rss(const pt::ptree &tree)
             {
                 guid = rssitem.get<string>("link");
             }
-            if (guid == _profile.last_guid)
+            if (guid == _profiledata.last_guid)
             {
                 break;
             }
 
             bool skipthis{false};
             string title{rssitem.get<string>("title")};
-            for (const auto &skip : _profile.skip)
+            for (const auto &skip : _profiledata.skip)
             {
                 if (title.substr(0, skip.length()) == skip)
                 {
@@ -171,11 +177,11 @@ void Document::parse_rss(const pt::ptree &tree)
             {
                 string desc
                     {remove_html(rssitem.get<string>("description"))};
-                for (const auto &fix : _profile.fixes)
+                for (const auto &fix : _profiledata.fixes)
                 {
                     desc = regex_replace(desc, regex{fix}, "");
                 }
-                return desc;
+                return add_hashtags(desc);
             }();
             item.guid = move(guid);
             item.link = rssitem.get<string>("link");
@@ -184,7 +190,7 @@ void Document::parse_rss(const pt::ptree &tree)
 
             BOOST_LOG_TRIVIAL(debug) << "Found GUID: " << item.guid;
 
-            if (_profile.last_guid.empty())
+            if (_profiledata.last_guid.empty())
             {
                 BOOST_LOG_TRIVIAL(debug) << "This is the first run.";
                 break;
@@ -232,4 +238,45 @@ string Document::extract_location(const RestClient::HeaderFields &headers) const
     }
     return location;
 }
+
+string Document::add_hashtags(const string &text)
+{
+    Json::Value json;
+    const auto filepath = _cfg.get_config_dir() /= "watchwords.json";
+    ifstream file{filepath};
+    if (file.good())
+    {
+        stringstream rawjson;
+        rawjson << file.rdbuf();
+        rawjson >> json;
+        BOOST_LOG_TRIVIAL(debug) << "Read " << filepath;
+    }
+    else
+    {
+        throw FileException{"File Not found:"
+                + (_cfg.get_config_dir() /= "watchwords.json").string()};
+    }
+
+    list<string> watchwords;
+    const auto &tags_profile = json[_cfg.profile]["tags"];
+    const auto &tags_global = json["global"]["tags"];
+    transform(tags_profile.begin(), tags_profile.end(),
+              std::back_inserter(watchwords),
+              [](const Json::Value &value) { return value.asString(); });
+    transform(tags_global.begin(), tags_global.end(),
+              std::back_inserter(watchwords),
+              [](const Json::Value &value) { return value.asString(); });
+
+    string out{text};
+    for (const auto &tag : watchwords)
+    {
+        regex re_tag("([[:space:][:punct:]]|^)("
+            + tag + ")([[:space:][:punct:]]|$)", regex::icase);
+        out = regex_replace(out, re_tag, "$1#$2$3", boost::format_first_only);
+    }
+
+    return out;
+}
+
+
 } // namespace mastorss
diff --git a/src/document.hpp b/src/document.hpp
index 6dd842f..3682e2c 100644
--- a/src/document.hpp
+++ b/src/document.hpp
@@ -69,7 +69,7 @@ public:
 
 private:
     Config &_cfg;
-    ProfileData &_profile;
+    ProfileData &_profiledata;
     string _raw_doc;
 
     void parse_rss(const pt::ptree &tree);
@@ -77,6 +77,7 @@ private:
     string remove_html(string html) const;
     [[nodiscard]]
     string extract_location(const RestClient::HeaderFields &headers) const;
+    string add_hashtags(const string &text);
 };
 } // namespace mastorss
 
diff --git a/src/main.cpp b/src/main.cpp
index f6c4d60..fc9d433 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -34,6 +34,7 @@ constexpr int noprofile = 1;
 constexpr int network = 2;
 constexpr int file = 3;
 constexpr int mastodon = 4;
+constexpr int json = 5;
 constexpr int unknown = 9;
 } // namespace error
 
@@ -90,25 +91,25 @@ int main(int argc, char *argv[])
         }
         else
         {
-            const string_view profile{args[1]};
-            BOOST_LOG_TRIVIAL(debug) << "Using profile: " << profile;
+            const string_view profilename{args[1]};
+            BOOST_LOG_TRIVIAL(debug) << "Using profile: " << profilename;
 
             try
             {
-                Config cfg{profile.data()};
+                Config cfg{profilename.data()};
                 Document doc{cfg};
                 doc.parse();
 
-                MastoAPI masto{cfg.data};
+                MastoAPI masto{cfg.profiledata};
                 if (!doc.new_items.empty())
                 {
                     for (const auto &item : doc.new_items)
                     {
                         masto.post_item(item);
-                        cfg.data.last_guid = item.guid;
+                        cfg.profiledata.last_guid = item.guid;
                         if (item != *doc.new_items.rbegin())
                         {       // Don't sleep if this is the last item.
-                            sleep_for(seconds(cfg.data.interval));
+                            sleep_for(seconds(cfg.profiledata.interval));
                         }
                     }
                     cfg.write();
@@ -134,6 +135,11 @@ int main(int argc, char *argv[])
                 cerr << e.what() << '\n';
                 return error::network;
             }
+            catch (const Json::RuntimeError &e)
+            {
+                cerr << "JSON error:\n" << e.what() << '\n';
+                return error::json;
+            }
             catch (const runtime_error &e)
             {
                 cerr << e.what() << '\n';