diff --git a/doc/requirements.txt b/doc/requirements.txt
index 4e367afe..ef64bf47 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,10 +1,6 @@
-# The order of packages is significant, because pip processes them in the order
-# of appearance. Changing the order has an impact on the overall integration
-# process, which may cause wedges in the gate later.
 sphinx>=2.0.0,!=2.1.0 # BSD
 openstackdocstheme>=2.2.1 # Apache-2.0
 os-api-ref>=1.4.0 # Apache-2.0
-sphinxcontrib-apidoc>=0.2.0  # BSD
 
 # releasenotes
 reno>=3.1.0 # Apache-2.0