Update ChangeLog for fix for #541 - out-of-tree CMake builds
diff --git a/ChangeLog b/ChangeLog
index 59808bc..6d7f1c2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -17,6 +17,8 @@
      when GCM is used. #441
    * Fix for key exchanges based on ECDH-RSA or ECDH-ECDSA which weren't
      enabled unless others were also present. Found by David Fernandez. #428
+   * Fix for out-of-tree builds using CMake. Found by jwurzer, and fix based on
+     a contribution from Tobias Tangemann. #541
 
 Changes
    * Extended test coverage of special cases, and added new timing test suite.