diff --git a/docs/support/project-structure.md b/docs/support/project-structure.md
index 034fba4cb8..c25e087e57 100644
--- a/docs/support/project-structure.md
+++ b/docs/support/project-structure.md
@@ -89,6 +89,12 @@ 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) -
+  An isomorphic client to interact with the Software Catalog. Backend plugins
+  can use the package directly. Frontend plugins can use the client by using
+  `@backstage/plugin-catalog` in combination with `useApi` and the
+  `catalogApiRef`.
+
 - [`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