diff --git a/.travis.yml b/.travis.yml
index 563806977a..146748d95a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -49,6 +49,8 @@ branches:
     - master
     - staging
     - trying
+    # to build docs
+    - v0.4.x
 
 notifications:
   email: