Fix thread-safety issue in debug.c
diff --git a/ChangeLog b/ChangeLog
index d2328b6..626b141 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,9 @@
    * Increase the minimum size of Diffie-Hellman parameters accepted by the
      lient to 1024 bits, to protect against Logjam attack.
 
+Bugfix
+   * Fix thread-safety issue in the SSL debug module.
+
 Changes
    * Add SSL_MIN_DHM_BYTES configuration parameter in config.h to choose the
      minimum size of Diffie-Hellman parameters accepted by the client.