diff --git a/.circleci/config.yml b/.circleci/config.yml
index 175ca9e..fbcc5fc 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -2,6 +2,9 @@ version: 2.1
 
 jobs:
   build-docs:
+    branches:
+      only:
+        - master
     docker:
       - image: circleci/python:latest
     steps: