diff --git a/docs/support/project-structure.md b/docs/support/project-structure.md
index 034fba4cb8..deb8c47777 100644
--- a/docs/support/project-structure.md
+++ b/docs/support/project-structure.md
@@ -89,6 +89,10 @@ are separated out into their own folder, see further down.
   There are no "core" packages in the backend. Instead we have `backend-common`
   which contains helper middleware and other utils.
 
+- [`catalog-client`](https://github.com/backstage/backstage/tree/master/packages/catalog-client) -
+  A client to communicate with Backstage software catalog. Recommended for backend plugins, compatible
+  but not recommended for frontend plugins (use `@backstage/plugin-catalog` package instead).
+
 - [`catalog-model/`](https://github.com/backstage/backstage/tree/master/packages/catalog-model) -
   You can consider this to be a library for working with the catalog of sorts.
   It contains the definition of an