diff --git a/docs/release-history.md b/docs/release-history.md
index 51acbbe2..e3fa859b 100644
--- a/docs/release-history.md
+++ b/docs/release-history.md
@@ -1,3 +1,9 @@
+## 4.24.0
+
+### Improvements
+
+- Nullable `TimeSpan` support in `ParquetSerializer` by @cliedeman in #409.
+
 ## 4.23.5
 
 ### Bug fixes