Migration-guide.md

@@ -9,6 +9,16 @@ The [[main integration document|Integration-guide]] always describes the most up
 
 A Play Services support library was added in case you want to upgrade to the Play Services 8.4. Just use the `b4s-android-sdk-playservices840.aar` or -`.jar` file instead of the existing `playservicesXXX` variant.
 
+The Retrofit dependency was updated to incorporate stability changes and be compatible with apps that still use Retrofit 1.X. Make sure your dependency looks like:
+
+```gradle
+dependencies {
+    compile 'com.squareup.retrofit:retrofit:2.0.0-beta3'
+    compile 'com.squareup.retrofit:converter-jackson:2.0.0-beta3'
+    ...
+}
+```
+
 Local logging was changed from a level-based to a feature-based distinction. To enable logging, now use the `B4SSetting.setShouldLogScan(boolean)` and `B4SSetting.setShouldLogMatching(boolean)` methods instead of `setShouldLogDebug` and `setShouldLogVerbose`. Scanning-related logs are reported using the `B4SSCN` tag, which campaign matching logs are still using the `B4S` tag. For example, to get all logs, use `adb logcat -s B4SSCN:* B4S:*` or to only get info and higher priority logs about campaign matching you can use `adb logcat -s B4S:I`.
 
 ## Upgrade to 1.7.0