Updated changelog.
diff --git a/CHANGES.txt b/CHANGES.txt
index 5bad89e..405bd49 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,15 +1,27 @@
Unreleased Changes (C++/Java/Python/PHP/Objective-C/C#/Ruby/JavaScript)
+ Protocol Compiler
+ * Fix the generated source information for reserved values in Enums.
+
C++
* Fix bug where `Descriptor::DebugString()` printed proto3 synthetic oneofs.
* Provide stable versions of `SortAndUnique()`.
* Make sure to cache proto3 optional message fields when they are cleared.
* Expose UnsafeArena methods to Reflection.
+ * Use std::string::empty() rather than std::string::size() > 0.
Kotlin
* Restrict extension setter and getter operators to non-nullable T.
+ Java
+ * Reduce the time spent evaluating isExtensionNumber by storing the extension
+ ranges in a TreeMap for faster queries. This is particularly relevant for
+ protos which define a large number of extension ranges, for example when
+ each tag is defined as an extension.
+ * Fix java bytecode estimation logic for optional fields.
+ * Optimize Descriptor.isExtensionNumber.
+
Python
* Make JSON parsing match C++ and Java when multiple fields from the same
oneof are present and all but one is null.
