diff --git a/src/client.hh b/src/client.hh
index f45b2d98..e40755ef 100644
--- a/src/client.hh
+++ b/src/client.hh
@@ -62,6 +62,7 @@ public:
   };
 
 private:
+  //! The actual window that this class is wrapping up
   Window   _window;
 
   //! The id of the group the window belongs to