diff --git a/Migration.md b/Migration.md
index 2154edc..04a9cab 100644
--- a/Migration.md
+++ b/Migration.md
@@ -9,6 +9,7 @@
 ## From `v5.x.x` to `v6.x.x`
 
  * The outputs produced by the `Base64` class are not compatible with those from previous versions anymore.
+ * The `Base64` class has been moved from the namespace `Delight\Auth` to the namespace `Delight\Base64`.
 
 ## From `v4.x.x` to `v5.x.x`