diff --git a/src/easy/entity.hpp b/src/easy/entity.hpp
index 4d6eb13..94eabcf 100644
--- a/src/easy/entity.hpp
+++ b/src/easy/entity.hpp
@@ -220,6 +220,9 @@ namespace Easy
          */
         void set(const string &key, const Json::Value &value);
 
+        /*!
+         *  @brief  Returns value of str as uint64_t.
+         */
         std::uint64_t stouint64(const string &str) const;
 
         /*!
diff --git a/src/return_types.hpp b/src/return_types.hpp
index 1bc6e03..bf8d8fe 100644
--- a/src/return_types.hpp
+++ b/src/return_types.hpp
@@ -99,6 +99,17 @@ namespace Mastodon
         string answer;
 
         return_call();
+
+        /*!
+         *  @brief  Construct new return type for calls.
+         *
+         *  @param ec  Error code
+         *  @param em  Error message
+         *  @param hec HTTP error code
+         *  @param a   Answer
+         *
+         *  @since  0.100.0
+         */
         return_call(const uint8_t ec, const string &em,
                     const uint16_t hec, const string &a);