diff --git a/docs/source/release/v3.13.0/framework.rst b/docs/source/release/v3.13.0/framework.rst
index f866c88b754557ecd4a989d68ca80418b0172718..536b6d28805af696511017e71b13c97ad53f3be9 100644
--- a/docs/source/release/v3.13.0/framework.rst
+++ b/docs/source/release/v3.13.0/framework.rst
@@ -9,6 +9,10 @@ Framework Changes
     putting new features at the top of the section, followed by
     improvements, followed by bug fixes.
 
+Instrument Definition Updates
+-----------------------------
+
+- The ALF IDF has been updated following a detector array alteration.
 
 Algorithms
 ----------