diff --git a/releases/2.42/README.md b/releases/2.42/README.md
index eb4e0154..43fd8636 100644
--- a/releases/2.42/README.md
+++ b/releases/2.42/README.md
@@ -11,6 +11,7 @@ To help you navigate the document, here's a detailed table of contents.
 ## Table of Contents
 
   - [API Changes](#api-changes)
+    - [Platform](#platform)
     - [Tracker](#tracker)
     - [Analytics](#analytics)
       - [Breaking Changes](#breaking-changes)
@@ -20,6 +21,12 @@ To help you navigate the document, here's a detailed table of contents.
 ---
 ## API Changes
 
+### Platform
+
+#### DataElement
+
+Updating the `valueType` of a `DataElement` is prohibited if there is any existing data associated with that `DataElement`. See [Jira issue](https://dhis2.atlassian.net/browse/DHIS2-18152).
+
 ### Analytics
 
 #### Breaking Changes