diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6145ff04f9..f7f9dace8a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,5 @@
 # v4.0.0
-- No changes. The same as `v4.0.0b1`.
+- api change V1PersistentVolumeSpec to V1ScaleIOPersistentVolumeSource #397.
 
 # v4.0.0b1
 - Make sure PyPI source distribution is complete with all files from the root directory