diff --git a/src/generators/html.cpp b/src/generators/html.cpp
index 4bbfd80..1938258 100644
--- a/src/generators/html.cpp
+++ b/src/generators/html.cpp
@@ -87,10 +87,24 @@ void write_html(ostream &out, const vector<entry_type> &entries)
     {
         out << "\n";
         out << "    <details id=\"" << entry.instance << "\">\n";
-        out << "      <summary>" << entry.report_time.substr(0, 10) << ": "
-            << entry.instance << "</summary>\n";
-        out << R"(      <a href="#)" << entry.instance
+        out << "      <summary>";
+        if (entry.unreachable)
+        {
+            out << "<del>";
+        }
+        out << entry.report_time.substr(0, 10) << ": " << entry.instance;
+        if (entry.unreachable)
+        {
+            out << "</del>";
+        }
+        out << "</summary>\n"
+            << R"(      <a href="#)" << entry.instance
             << R"(" class="small">Hyperlink to this entry</a>)" << '\n';
+        if (entry.unreachable)
+        {
+            out << "      <p><em>This instance is currently "
+                   "unreachable.</em></p>\n";
+        }
         out << "      <p>" << cgi::text2html(entry.description) << "</p>\n";
         out << "      <p><strong>Tags:</strong> ";
         for (const auto &tag : entry.tags)