diff --git a/docs/changelog.rst b/docs/changelog.rst
index 6a56325e..3754b010 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -6,7 +6,7 @@ Changelog
 Development
 ===========
 - (Fill this out as you fix issues and develop your features).
-- BREAKING CHANGE: Drop support for positional arguments when instantiating a document. #?
+- BREAKING CHANGE: Drop support for positional arguments when instantiating a document. #2103
   - From now on keyword arguments (e.g. `Doc(field_name=value)`) are required.
 
 Changes in 0.18.1