diff --git a/src/app/app.cpp b/src/app/app.cpp
index 8b0e9150..b6fc6ed5 100644
--- a/src/app/app.cpp
+++ b/src/app/app.cpp
@@ -1045,6 +1045,8 @@ Event CApplication::ProcessSystemEvent()
         event.key.unicode = m_private->currentEvent.key.keysym.unicode;
         event.kmodState = m_private->currentEvent.key.keysym.mod;
 
+        // Some keyboards return numerical enter keycode instead of normal enter
+        // See issue #427 for details
         if(event.key.key == KEY(KP_ENTER))
             event.key.key = KEY(RETURN);
     }