diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 4445a19d..74ba534e 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,7 @@
+### 5.3.0
+* case-insensitivity for command-line enums.
+* Add SubCommand attribute for nullary subcommands.
+
 ### 5.2.0
 * Fix SourceLink issues.