mention dockerhub rate limits (coder#456)

bpmct · web-flow · commit 33f202829ffc · 2021-06-30T14:46:44.000-05:00
diff --git a/admin/registries/index.md b/admin/registries/index.md
@@ -21,8 +21,10 @@ To import an image:
    However, to _add_ a registry, click **Add a new registry**, which is the
    option located immediately below the registry selector.
 1. You'll be asked to provide a **registry name** and the **registry**.
-1. **Optional.** If your registry is a **private registry**, provide the
-   **username** and **password** combination required to access the registry.
+1. **Optional.** If your registry is a **private registry** or you want to avoid
+   hitting [rate limits](https://www.docker.com/increase-rate-limits), provide
+   the **username** and **password** combination required to access the
+   registry.
 1. Continue with the process of [adding your image](../../images/index.md).
 1. When done, click **Import**.
 
