diff --git a/docs/custom_conf.py b/docs/custom_conf.py
index 6e5bea28f..d26d27d85 100644
--- a/docs/custom_conf.py
+++ b/docs/custom_conf.py
@@ -142,8 +142,8 @@
 
 # Links to ignore when checking links
 linkcheck_ignore = [
-    'http://127.0.0.1:8000'
-    'https://leonelson.com/2011/08/15/how-to-increase-your-csr-key-size-on-microsoft-iis-without-removing-the-production-certificate/'
+    'http://127.0.0.1:8000',
+    'https://leonelson.com/2011/08/15/how-to-increase-your-csr-key-size-on-microsoft-iis-without-removing-the-production-certificate/',
     ]
 
 # Pages on which to ignore anchors