diff --git a/docs/src/conf.py b/docs/src/conf.py
index 03c41b9b75..2534cd5c02 100644
--- a/docs/src/conf.py
+++ b/docs/src/conf.py
@@ -400,6 +400,7 @@ def _dotv(version):
     "https://stickler-ci.com/",
     "https://twitter.com/scitools_iris",
     "https://stackoverflow.com/questions/tagged/python-iris",
+    "https://www.flaticon.com/",
 ]
 
 # list of sources to exclude from the build.