diff --git a/docs/plugins/sort.rst b/docs/plugins/sort.rst
index 95033d949..eb3e20663 100644
--- a/docs/plugins/sort.rst
+++ b/docs/plugins/sort.rst
@@ -105,6 +105,13 @@ can search for that text as well. This is often a job name or a status, like
 "caged". The work animal assignment page can also filter by squad or burrow
 membership.
 
+Work animals overlay
+--------------------
+
+In addition to the search and filter widgets provided by the Info tabs overlay,
+the work animal assignment screen has an additional overlay that annotates each
+visible unit with the number of work animals that unit already has.
+
 Interrogation overlay
 ---------------------