diff --git a/src/longopt/gmtsimplify_inc.h b/src/longopt/gmtsimplify_inc.h
index f79c7809311..870851db56d 100644
--- a/src/longopt/gmtsimplify_inc.h
+++ b/src/longopt/gmtsimplify_inc.h
@@ -25,10 +25,7 @@ static struct GMT_KEYWORD_DICTIONARY module_kw[] = {
 		  short_directives,    long_directives,
 		  short_modifiers,     long_modifiers,
 		  transproc_mask */
-	{ 0, 'T', "",
-	          "",                  "",
-	          "",                  "",
-		  GMT_TP_STANDARD },
+	{ 0, 'T', "tolerance",         "", "", "", "", GMT_TP_STANDARD },
 	{ 0, '\0', "", "", "", "", "", 0 }  /* End of list marked with empty option and strings */
 };
 #endif  /* !GMTSIMPLIFY_INC_H */