diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7790bf9..425eb42 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## Version 0.5.1
+
+- Added parser for delayed sparse objects backed by H5
+
 ## Version 0.5.0
 
 - Complete overhaul of the codebase using pybind11