Added CHANGELOG.md entry on syntax-only generic methods.

R=lrn@google.com, mit@google.com

Review URL: https://codereview.chromium.org/2532863002 .
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 28cfa01..b90703a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ### Language
 
+* Support generic method syntax. Type arguments are not available at
+  runtime. For details, check the
+  [informal specification](https://gist.github.com/eernstg/4353d7b4f669745bed3a5423e04a453c).
 * Support access to initializing formals, e.g., the use of `x` to initialize
  `y` in `class C { var x, y; C(this.x): y = x; }`.
   Please check the