diff --git a/README.md b/README.md
index 834f2878..a03ca37e 100644
--- a/README.md
+++ b/README.md
@@ -404,6 +404,12 @@ rootCmd.Flags().StringVarP(&Region, "region", "r", "", "AWS region (required)")
 rootCmd.MarkFlagRequired("region")
 ```
 
+Pesistent flags should be marked as required using a separate function:
+```go
+rootCmd.PersistentFlags().StringVarP(&Region, "region", "r", "", "AWS region (required)")
+rootCmd.MarkPersistentFlagRequired("region")
+```
+
 ## Positional and Custom Arguments
 
 Validation of positional arguments can be specified using the `Args` field