diff --git a/docs/conf.py b/docs/conf.py
index 771ff77..f344b33 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -129,7 +129,7 @@
 rediraffe_redirects = "redirects.txt"
 rediraffe_branch = "master~1"
 
-htmlhelp_basename = "%sdoc" % about["__title__"]
+htmlhelp_basename = f"{about['__title__']}doc"
 
 latex_documents = [
     (