diff --git a/changelog.d/19752.1.doc b/changelog.d/19752.1.doc
new file mode 100644
index 0000000000..cfee70c67c
--- /dev/null
+++ b/changelog.d/19752.1.doc
@@ -0,0 +1 @@
+Document the paths that can be handled on workers with stabilised delegated authentication.
diff --git a/docs/workers.md b/docs/workers.md
index 3e4e23e500..91e3169a36 100644
--- a/docs/workers.md
+++ b/docs/workers.md
@@ -290,6 +290,9 @@ information.
     # Unstable MSC4140 support
     ^/_matrix/client/unstable/org.matrix.msc4140/delayed_events(/.*/restart)?$
 
+    # Stabilised Delegated Authentication support (`matrix_authentication_service.enabled: true`)
+    ^/_synapse/mas/
+
 Additionally, the following REST endpoints can be handled for GET requests:
 
     # Push rules requests