Clarified Changelog for fix #602
diff --git a/ChangeLog b/ChangeLog
index e91bc2f..b8d3a5b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -24,7 +24,7 @@
      builds where the configuration POLARSSL_PEM_WRITE_C is not defined. Found
      by inestlerode. #559.
    * Fix documentation and implementation missmatch for function arguments of
-     mbedtls_gcm_finish(). Found by cmiatpaar.
+     mbedtls_gcm_finish(). Found by cmiatpaar. #602
 
 Changes
    * Add compile time option for relaxed X509 time verification to enable