diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index aba2cf096..f8e8633bf 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -20,7 +20,8 @@ Configuration for ixmp and its storage backends has been streamlined.
 
 - [#189](https://github.com/iiasa/ixmp/pull/189): Identify and load Scenarios using URLs.
 - [#182](https://github.com/iiasa/ixmp/pull/182),
-  [#200](https://github.com/iiasa/ixmp/pull/200): Add new Backend, Model APIs and JDBCBackend, GAMSModel classes.
+  [#200](https://github.com/iiasa/ixmp/pull/200),
+  [#213](https://github.com/iiasa/ixmp/pull/213): Add new Backend, Model APIs and CachingBackend, JDBCBackend, GAMSModel classes.
 - [#188](https://github.com/iiasa/ixmp/pull/188),
   [#195](https://github.com/iiasa/ixmp/pull/195): Enhance reporting.
 - [#177](https://github.com/iiasa/ixmp/pull/177): add ability to pass `gams_args` through `Scenario.solve()`