diff --git a/simgear/misc/commands.hxx b/simgear/misc/commands.hxx
index 198714a1..4b7abbb4 100644
--- a/simgear/misc/commands.hxx
+++ b/simgear/misc/commands.hxx
@@ -212,6 +212,6 @@ private:
 
 };
 
-#endif __COMMANDS_HXX
+#endif // __COMMANDS_HXX
 
 // end of commands.hxx