diff --git a/content/en/docs/concepts/storage/volume-pvc-datasource.md b/content/en/docs/concepts/storage/volume-pvc-datasource.md
index 85774f4eb6..3178029419 100644
--- a/content/en/docs/concepts/storage/volume-pvc-datasource.md
+++ b/content/en/docs/concepts/storage/volume-pvc-datasource.md
@@ -60,6 +60,10 @@ spec:
     name: pvc-1
 ```
 
+{{< note >}}
+You must specify a capacity value for `spec.resources.requests.storage`, and the value you specify must be the same or larger than the capacity of the source volume.
+{{< /note >}}
+
 The result is a new PVC with the name `clone-of-pvc-1` that has the exact same content as the specified source `pvc-1`.
 
 ## Usage