diff --git a/general-info/release-20c.txt b/general-info/release-20c.txt
index 424f1d0691a3550e1ac4a1b60920c7efa5318b9a..1cb9789be83670ee54c1b136a81d0a4a348b82b2 100644
--- a/general-info/release-20c.txt
+++ b/general-info/release-20c.txt
@@ -38,6 +38,9 @@ New in this release:
       READ-SEQUENCE cannot do that unless the stream is a
       binary-text-stream.   This is an incompatible change from
       previous releases.
+    - RUN-PROGRAM accepts :EXTERNAL-FORMAT parameter to specify the
+      external format to be used for any streams that RUN-PROGRAM
+      needs to create.
 
   * ANSI compliance fixes:
     - Fixes for signaling errors with READ-CHAR and READ-BYTE