diff --git a/cmdcomp/v2/command/argument/select_argument.py b/cmdcomp/v2/command/argument/select_argument.py
index 5f215a7..4cbcbcc 100644
--- a/cmdcomp/v2/command/argument/select_argument.py
+++ b/cmdcomp/v2/command/argument/select_argument.py
@@ -24,7 +24,7 @@ class V2SelectArgument(HasAlias, Model):
     )
 
     raw_values: Annotated[
-        str | list[str | V2ValueArgument] | OrderedDict[str, str | V2ValueArgument],
+        list[str | V2ValueArgument] | OrderedDict[str, str | V2ValueArgument],
         Field(
             title="candidate selection.",
             alias="values",
diff --git a/docs/config.schema.json b/docs/config.schema.json
index 48f6b8b..28e3495 100644
--- a/docs/config.schema.json
+++ b/docs/config.schema.json
@@ -555,9 +555,6 @@
                 },
                 "values": {
                     "anyOf": [
-                        {
-                            "type": "string"
-                        },
                         {
                             "items": {
                                 "anyOf": [