[ci skip] Prepare for 3.1.1 release
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 1e59d4c..c7bd502 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -5,7 +5,7 @@
 Version 3.1.1
 =============
 
-Release Date: Not Released
+Release Date: Oct 22, 2016
 
 -  **Security**