diff --git a/changelog.d/13221.doc b/changelog.d/13221.doc
new file mode 100644
index 0000000000..dd2b3d8972
--- /dev/null
+++ b/changelog.d/13221.doc
@@ -0,0 +1 @@
+Document which HTTP resources support gzip compression.
diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md
index eefcc7829d..5558b0d2ec 100644
--- a/docs/usage/configuration/config_documentation.md
+++ b/docs/usage/configuration/config_documentation.md
@@ -486,7 +486,8 @@ Sub-options for each listener include:
 
    * `names`: a list of names of HTTP resources. See below for a list of valid resource names.
 
-   * `compress`: set to true to enable HTTP compression for this resource.
+   * `compress`: set to true to enable gzip compression on HTTP bodies for this resource. This is currently only supported with the
+     `client`, `consent` and `metrics` resources.
 
 * `additional_resources`: Only valid for an 'http' listener. A map of
    additional endpoints which should be loaded via dynamic modules.