diff --git a/NEWS.md b/NEWS.md
index 02a13acf68..849188a8f1 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -30,6 +30,9 @@ Note: We're only listing outstanding class updates.
     * Module.used_refinements has been added. [[Feature #14332]]
     * Module#refinements has been added. [[Feature #12737]]
 
+* Proc
+    * Proc#dup returns an instance of subclass. [[Bug #17545]]
+
 * Refinement
     * Refinement#refined_class has been added. [[Feature #12737]]
 
@@ -109,4 +112,5 @@ The following deprecated APIs are removed.
 [Feature #16131]: https://bugs.ruby-lang.org/issues/16131
 [Feature #17351]: https://bugs.ruby-lang.org/issues/17351
 [Feature #17391]: https://bugs.ruby-lang.org/issues/17391
+[Bug #17545]:     https://bugs.ruby-lang.org/issues/17545
 [Feature #18351]: https://bugs.ruby-lang.org/issues/18351