THRIFT-4702: Improve AutoExpandingBuffer
diff --git a/lib/java/README.md b/lib/java/README.md
index 1e4aed2..cdd4059 100644
--- a/lib/java/README.md
+++ b/lib/java/README.md
@@ -161,3 +161,12 @@
 
 Gradle
 http://gradle.org/
+
+# Breaking Changes
+
+## 0.12.0
+
+The access modifier of the AutoExpandingBuffer class has been changed from
+public to default (package) and will no longer be accessible by third-party
+libraries.
+