diff --git a/function.go b/function.go
index e127c23..5cedd7d 100644
--- a/function.go
+++ b/function.go
@@ -168,6 +168,7 @@ func newFuncInfo(name string, functor Functor, returnType string, params []ExprF
 				return nil, fmt.Errorf("can't specify non-optional param after optional ones: %q", p.Name())
 			}
 			if p.IsRepeat() {
+				minArgs--
 				maxArgs = -1
 			}
 		}
@@ -221,7 +222,7 @@ func (info *funcInfo) ToString(opt FmtOpt) string {
 	if info.maxArgs < 0 {
 		sb.WriteString(" ...")
 	}
-	sb.WriteString("): ")
+	sb.WriteString("):")
 	if len(info.returnType) > 0 {
 		sb.WriteString(info.returnType)
 	} else {