diff --git a/doc/print_errors.py b/doc/print_errors.py
index 6e9d4a3599..3652dc22d9 100644
--- a/doc/print_errors.py
+++ b/doc/print_errors.py
@@ -1,4 +1,4 @@
-"""Read errors output from a sphinx build and remove duplicate groups"""
+"""Read errors output from a Sphinx build and remove duplicate groups."""
 import sys
 import os
 import pathlib