[ci skip] Mark the start of 3.1.1 development
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 058eb27..c09c1b5 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -2,6 +2,19 @@
 Change Log
 ##########
 
+Version 3.1.1
+=============
+
+Release Date: Not Released
+
+
+
+Bug fixes for 3.1.1
+-------------------
+
+
+
+
 Version 3.1.0
 =============