diff --git a/docs/src/conf.py b/docs/src/conf.py
index ea12b83aaf..e0d8148a54 100644
--- a/docs/src/conf.py
+++ b/docs/src/conf.py
@@ -396,6 +396,7 @@ def _dotv(version):
     "https://www.metoffice.gov.uk/",
     "https://biggus.readthedocs.io/",
     "https://stickler-ci.com/",
+    "https://twitter.com/scitools_iris",
 ]
 
 # list of sources to exclude from the build.