diff --git a/doc/source/api_changes.txt b/doc/source/api_changes.txt
index c363288d..bf9ddb60 100644
--- a/doc/source/api_changes.txt
+++ b/doc/source/api_changes.txt
@@ -1,6 +1,8 @@
 Version 0.9
 -----------
-- No longer wrap ``imread`` output in an ``Image`` class.
+- No longer wrap ``imread`` output in an ``Image`` class
+- Change default value of `sigma` parameter in ``skimage.segmentation.slic``
+  to 0
 
 Version 0.4
 -----------