diff --git a/docs/usage/index.html b/docs/usage/index.html
index 33879ee..1ba52bd 100644
--- a/docs/usage/index.html
+++ b/docs/usage/index.html
@@ -27,7 +27,7 @@ Usage: ./bin/kubeconform [OPTION]... [FILE OR FOLDER]...
   -skip string
         comma-separated list of kinds to ignore
   -strict
-        disallow additional properties not in schema
+        disallow additional properties not in schema or duplicated keys
   -summary
         print a summary at the end (ignored for junit output)
   -v	show version information