Add note in migration.md

diff --git a/site/content/docs/5.0/migration.md b/site/content/docs/5.0/migration.md
index e0ef86ca3f5461d96c47ce63871556badef3a66e..340f8536d757c81cb091ad846cc0dccffc492dae 100644 (file)
--- a/site/content/docs/5.0/migration.md
+++ b/site/content/docs/5.0/migration.md
@@ -15,6 +15,10 @@ toc: true
 
 ## v5.0.0-alpha3
 
+### JavaScript
+
+- Data attributes for all JavaScript plugins are now namespaced to help distinguish Bootstrap functionality from third parties and your own code. For example, we use `data-bs-toggle` instead of `data-toggle`.
+
 ### Browser support
 
 - Dropped support for Microsoft Edge Legacy. See [here](#browser-support-1) for the previous browser support changes.