Add ChangeLog entry

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/ChangeLog b/ChangeLog
index 07cc876..d26b9cd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -9,6 +9,8 @@
    * Remove a duplicate #include in a sample program. Fixed by Masashi Honma #2326.
    * Reduce stack usage of `mpi_write_hlp()` by eliminating recursion.
      Fixes #2190.
+   * Fix memory leak in in mpi_miller_rabin(). Contributed by
+     Jens Wiklander <jens.wiklander@linaro.org> in #2363.
 
 Changes
    * Include configuration file in all header files that use configuration,