diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -128,6 +128,9 @@
 Changes to the C API
 --------------------
 
+* An interface to the new Pass Manager has been added in the
+  ``llvm-c/Transforms/PassBuilder.h`` header.
+
 
 Changes to the Go bindings
 --------------------------