diff --git a/include/Mw/StringDefs.h b/include/Mw/StringDefs.h
index 60657fe..5e02854 100644
--- a/include/Mw/StringDefs.h
+++ b/include/Mw/StringDefs.h
@@ -29,16 +29,16 @@
 #define MwNiconPixmap "ViconPixmap"
 #define MwNsizeHints "VsizeHints"
 
-#define MwNactivateHandler "Cactivate"
-#define MwNresizeHandler "Cresize"
-#define MwNtickHandler "Ctick"
-#define MwNmenuHandler "Cmenu"
-#define MwNmouseDownHandler "CmouseDownHandler"
-#define MwNmouseUpHandler "CmouseUpHandler"
-#define MwNmouseMoveHandler "CmouseMoveHandler"
-#define MwNchangedHandler "CchangedHandler"
-#define MwNkeyHandler "CkeyHandler"
-#define MwNkeyReleaseHandler "CkeyReleaseHandler"
-#define MwNcloseHandler "CcloseHandler"
+#define MwNactivateHandler "Cactivate"		  /* NULL */
+#define MwNresizeHandler "Cresize"		  /* NULL */
+#define MwNtickHandler "Ctick"			  /* NULL */
+#define MwNmenuHandler "Cmenu"			  /* MwMenu */
+#define MwNmouseDownHandler "CmouseDownHandler"	  /* MwLLMouse* */
+#define MwNmouseUpHandler "CmouseUpHandler"	  /* asme as MwNmouseDownHandler */
+#define MwNmouseMoveHandler "CmouseMoveHandler"	  /* MwPoint* */
+#define MwNchangedHandler "CchangedHandler"	  /* NULL */
+#define MwNkeyHandler "CkeyHandler"		  /* int* (MwLLKeyEnum or character code) */
+#define MwNkeyReleaseHandler "CkeyReleaseHandler" /* same as MwNkeyHandler */
+#define MwNcloseHandler "CcloseHandler"		  /* NULL */
 
 #endif