diff --git a/docs/guide/platform-difference.md b/docs/guide/platform-difference.md
index e4b9720..ec8f2ff 100644
--- a/docs/guide/platform-difference.md
+++ b/docs/guide/platform-difference.md
@@ -58,6 +58,6 @@
 + [《navigator control》](../docs/modules/navigator.html)
 + [《storage》](../docs/modules/storage.html)
 
-In order to maintain the versatility of the framework, Weex's built-in native modules are limited, but Weex provides the ability to extend native modules. For specific extension methods, please refer to [《iOS extend》](./extend/extend-ios.html) 和[《Android extend》](./extend/extend-android.html)。
+In order to maintain the versatility of the framework, Weex's built-in native modules are limited, but Weex provides the ability to extend native modules. For specific extension methods, please refer to [《iOS extend》](./extend/extend-ios.html) and[《Android extend》](./extend/extend-android.html)。
 
 > Some interfaces also exist in the browser environment, but you should pay attention to browser compatibility when using them; for example, the clipboard function, for security reasons, most browsers restrict their use.