diff --git a/general-info/release-20c.txt b/general-info/release-20c.txt
index ee77dc3f8e68e5165a13e6e373b22feb5ad0c679..72de2bfddefbed6cb80a0bc365cc89724c23e18d 100644
--- a/general-info/release-20c.txt
+++ b/general-info/release-20c.txt
@@ -81,6 +81,8 @@ New in this release:
       returned because GET-BEST-AUTHORIZATION was looking for the
       hostname.
     - FORMAT signals an warning if ~:; is used inside ~:[.
+    - SET-SYSTEM-EXTERNAL-FORMAT was not actually setting the filename
+      encoding if given.
  
   * Trac Tickets: