diff --git a/docs/supported.rst b/docs/supported.rst
index b2f8e5a..538629e 100644
--- a/docs/supported.rst
+++ b/docs/supported.rst
@@ -42,6 +42,7 @@ support synchronizing tasks, vdirsyncer does too.
   changes back to disk when the editor closes.
 
 .. _todoman: https://hugo.barrera.io/journal/2015/03/30/introducing-todoman/
+.. _watdo: https://github.com/untitaker/watdo
 
 
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