diff --git a/general-info/release-20a.txt b/general-info/release-20a.txt
index d1b3117f3029acbe1237650d4a90cb9e915e3b3a..6dd9b02bd994cf2592a99bd41f6eba077d5ec7c4 100644
--- a/general-info/release-20a.txt
+++ b/general-info/release-20a.txt
@@ -32,6 +32,10 @@ New in this release:
       characters by upcasing the character.  This isn't necessary
       since the characters are not EQUAL, so make SXHASH return
       different values for upper and lower case letter.
+    - WRITE-VECTOR was not writing out enough data when no
+      byte-swapping is needed and the end index was not given.
+      (Confusion about the length of the vector versus the index as an
+      octet count, not element count.)
 
   * Trac Tickets:
     #31: pathname bug with :case :common