diff --git a/src/misc1.c b/src/misc1.c
index 82dbbba..6dbad3f 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -1095,11 +1095,10 @@
 }
 
 /*
- * Give a warning for an error.
+ * Give a warning for an error. "val" is one of the BO_ values, e.g., BO_OPER.
  */
     void
-vim_beep(
-    unsigned val) // one of the BO_ values, e.g., BO_OPER
+vim_beep(unsigned val)
 {
 #ifdef FEAT_EVAL
     called_vim_beep = TRUE;