diff --git a/engine/release-notes.md b/engine/release-notes.md
index a6ac3c2595..bb46be7767 100644
--- a/engine/release-notes.md
+++ b/engine/release-notes.md
@@ -60,6 +60,9 @@ consistency and compatibility reasons.
 * Add socket activation for RHEL-based distributions. [docker/docker-ce-packaging#274](https://github.com/docker/docker-ce-packaging/pull/274)
 * Add libseccomp requirement for RPM packages. [docker/docker-ce-packaging#266](https://github.com/docker/docker-ce-packaging/pull/266)
 
+### Known Issues
+* When upgrading from 18.09.0 to 18.09.1, `containerd` is not upgraded to the correct version on Ubuntu.  [Learn more](https://success.docker.com/article/error-upgrading-to-engine-18091-with-containerd).
+
 ## 18.09 
 2018-11-08