diff --git a/docs/source/conf.py b/docs/source/conf.py
index 0609f0c..3764ce5 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -85,6 +85,8 @@
     "https://support.zadarastorage.com",
     "https://stackoverflow.com/questions/24447047/remove-git-annex-repository-from-file-tree",
     "https://joinup.ec.europa.eu/collection/eupl/solution/joinup-licensing-assistant/jla-compatibility-checker",
+    "http://ccdb.ucsd.edu/home",
+    "https://opensource.org/licenses/BSD-3-Clause ",
 ]
 # The linkcheck builder will skip verifying that anchors exist when checking
 # these URLs (e.g. because they are generated by JavaScript).