diff --git a/doc/F-Stack_Nginx_APP_Guide.md b/doc/F-Stack_Nginx_APP_Guide.md
index e31a7fa2b..458b0fbbc 100644
--- a/doc/F-Stack_Nginx_APP_Guide.md
+++ b/doc/F-Stack_Nginx_APP_Guide.md
@@ -55,7 +55,7 @@ All the directives below are available only when ```NGX_HAVE_FSTACK``` is define
 
 ```
     Syntax: proxy_kernel_network_stack on | off;
-    Default: kernel_network_stack off;
+    Default: proxy_kernel_network_stack off;
     Context: http, stream, mail, server
 
     Determines whether proxy should go through kernel network stack or fstack.