diff --git a/ThreeMigrationGuide.md b/ThreeMigrationGuide.md
index afd30d22a..eafc3e572 100644
--- a/ThreeMigrationGuide.md
+++ b/ThreeMigrationGuide.md
@@ -1,3 +1,23 @@
-### Texture 3.0 Migration Guide ###
+## Texture 3.0 Migration Guide
 
-Got a tip for upgrading? Please open a PR to this document!
\ No newline at end of file
+Got a tip for upgrading? Please open a PR to this document!
+
+
+### Breaking API Changes
+
+`ASImageCacherCompletion` typedef has a new parameter: `ASImageCacheType cacheType`. Example:
+
+
+```swift
+ASPINRemoteImageDownloader.shared().cachedImage(with: url, callbackQueue: .main) { result in
+    …
+}
+```
+
+Becomes
+
+```swift
+ASPINRemoteImageDownloader.shared().cachedImage(with: url, callbackQueue: .main) { result, cacheType in
+    …
+}
+```