diff --git a/doc/F-Stack_Nginx_APP_Guide.md b/doc/F-Stack_Nginx_APP_Guide.md
index 80686cea..e94130f0 100644
--- a/doc/F-Stack_Nginx_APP_Guide.md
+++ b/doc/F-Stack_Nginx_APP_Guide.md
@@ -63,7 +63,7 @@ All the directives below are available only when ```NGX_HAVE_FSTACK``` is define
 
 ```
     Syntax: schedule_timeout time;
-    Default: schedule_timeout 30m;
+    Default: schedule_timeout 30ms;
     Context: http, server
 
     Sets a time interval for polling kernel_network_stack. The default value is 30 msec.