diff --git a/docs/conf.py b/docs/conf.py
index 866dd4f..e15de8a 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -156,3 +156,6 @@
      author, 'Python-IHM', 'One line description of project.',
      'Miscellaneous'),
 ]
+
+# Warn about broken links to classes, etc.
+nitpicky = True