diff --git a/README.md b/README.md
index 068e6d86..f9fd0624 100644
--- a/README.md
+++ b/README.md
@@ -475,6 +475,8 @@ Example spec file for volumes and volume mounts
 
 ```
 
+> :warning: **Volume and VolumeMount names cannot contain underscores(_)**
+
 ## Development
 
 ### Testing