diff --git a/include/SFML/Network/Ftp.hpp b/include/SFML/Network/Ftp.hpp
index 4dd242b67..a4acbde76 100644
--- a/include/SFML/Network/Ftp.hpp
+++ b/include/SFML/Network/Ftp.hpp
@@ -127,10 +127,10 @@ public:
             FilenameNotAllowed      = 553, ///< Requested action not taken, file name not allowed
 
             // 10xx: SFML custom codes
-            InvalidResponse  = 1000, ///< Response is not a valid FTP one
-            ConnectionFailed = 1001, ///< Connection with server failed
-            ConnectionClosed = 1002, ///< Connection with server closed
-            InvalidFile      = 1003  ///< Invalid file to upload / download
+            InvalidResponse  = 1000, ///< Not part of the FTP standard, generated by SFML when a received response cannot be parsed
+            ConnectionFailed = 1001, ///< Not part of the FTP standard, generated by SFML when the low-level socket connection with the server fails
+            ConnectionClosed = 1002, ///< Not part of the FTP standard, generated by SFML when the low-level socket connection is unexpectedly closed
+            InvalidFile      = 1003  ///< Not part of the FTP standard, generated by SFML when a local file cannot be read or written
         };
 
         ////////////////////////////////////////////////////////////
@@ -559,7 +559,10 @@ private:
 /// return additional data, and use a class derived from
 /// sf::Ftp::Response to provide this data. The most often used
 /// commands are directly provided as member functions, but it is
-/// also possible to use specific commands with the sendCommand() method.
+/// also possible to use specific commands with the sendCommand() function.
+///
+/// Note that response statuses >= 1000 are not part of the FTP standard,
+/// they are generated by SFML when an internal error occurs.
 ///
 /// All commands, especially upload and download, may take some
 /// time to complete. This is important to know if you don't want