diff --git a/docs/buildah-push.1.md b/docs/buildah-push.1.md
index 9281b172be..5d000693ad 100644
--- a/docs/buildah-push.1.md
+++ b/docs/buildah-push.1.md
@@ -41,6 +41,7 @@ The default certificates directory is _/etc/containers/certs.d_.
 **--compression-format** *format*
 
 Specifies the compression format to use.  Supported values are: `gzip`, `zstd` and `zstd:chunked`.
+`zstd:chunked` is incompatible with encrypting images, and will be treated as `zstd` with a warning in that case.
 
 **--compression-level** *level*