diff --git a/requirements-docs.txt b/requirements-docs.txt
index a4b201d4..43f94e9b 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -1,4 +1,4 @@
 sphinx
 sphinx_rtd_theme
 importlib_metadata; python_version < "3.8"
-doc-utils<0.18
+doc-utils<0.18  # Fix for read the docs default sphinx version. If we update sphinx, test to see if we can remove this.