diff --git a/func-string.go b/func-string.go
index 3c6bccb..b9236f1 100644
--- a/func-string.go
+++ b/func-string.go
@@ -205,12 +205,14 @@ func ImportStringFuncs(ctx ExprContext) {
 
 	ctx.RegisterFunc("startsWithStr", newGolangFunctor(startsWithStrFunc), typeBoolean, []ExprFuncParam{
 		newFuncParam(paramSource),
-		newFuncParamFlag(paramPrefix, pfRepeat),
+		newFuncParam(paramPrefix),
+		newFuncParamFlag("other "+paramPrefix, pfRepeat),
 	})
 
 	ctx.RegisterFunc("endsWithStr", newGolangFunctor(endsWithStrFunc), typeBoolean, []ExprFuncParam{
 		newFuncParam(paramSource),
-		newFuncParamFlag(paramSuffix, pfRepeat),
+		newFuncParam(paramSuffix),
+		newFuncParamFlag("other "+paramSuffix, pfRepeat),
 	})
 }