diff --git a/en-US/dita/RTC-NG/API/callback_irtcengineeventhandler_onfirstlocalvideoframepublished.dita b/en-US/dita/RTC-NG/API/callback_irtcengineeventhandler_onfirstlocalvideoframepublished.dita
index 77923a9c262..f7fd3e4198a 100644
--- a/en-US/dita/RTC-NG/API/callback_irtcengineeventhandler_onfirstlocalvideoframepublished.dita
+++ b/en-US/dita/RTC-NG/API/callback_irtcengineeventhandler_onfirstlocalvideoframepublished.dita
@@ -35,8 +35,8 @@
     connection: RtcConnection,
     elapsed: number
   ): void;</codeblock>
-            <codeblock props="flutter" outputclass="language-dart">final void Function(VideoSourceType source, int elapsed)?
-    onFirstLocalVideoFramePublished;</codeblock>
+            <codeblock props="flutter" outputclass="language-dart">final void Function(RtcConnection connection, int elapsed)?
+      onFirstLocalVideoFramePublished;</codeblock>
             <codeblock props="reserve" outputclass="language-cpp"></codeblock></p>
         </section>
         <section id="detailed_desc">