diff --git a/controller/relay-text.go b/controller/relay-text.go
index 830fd24c..b9a300b4 100644
--- a/controller/relay-text.go
+++ b/controller/relay-text.go
@@ -368,6 +368,7 @@ func relayTextHelper(c *gin.Context, relayMode int) *OpenAIErrorWithStatusCode {
 		case APITypeTencent:
 			req.Header.Set("Authorization", apiKey)
 		case APITypePaLM:
+			// do not set Authorization header
 		default:
 			req.Header.Set("Authorization", "Bearer "+apiKey)
 		}