diff --git a/app/src/editor/openLink.ts b/app/src/editor/openLink.ts
index 29eee6a52..fc9858a31 100644
--- a/app/src/editor/openLink.ts
+++ b/app/src/editor/openLink.ts
@@ -28,6 +28,7 @@ export const openLink = (protyle: IProtyle, aLink: string, event?: MouseEvent, c
         if (Constants.SIYUAN_ASSETS_EXTS.includes(pathPosix().extname(linkAddress)) &&
             (
                 !linkAddress.endsWith(".pdf") ||
+                    // 本地 pdf 仅 assets/ 开头的才使用 siyuan 打开
                 (linkAddress.endsWith(".pdf") && linkAddress.startsWith("assets/"))
             )
         ) {