diff --git a/src/general-info/release-21b.txt b/src/general-info/release-21b.txt
index 9d667f3a2f143db6a9689c85152827f2a5676bbb..ef941be440552cfd8da3cf853d8183b6f4705c95 100644
--- a/src/general-info/release-21b.txt
+++ b/src/general-info/release-21b.txt
@@ -53,6 +53,8 @@ New in this release:
     * More descriptive docstring for
       * *environment-list*
       * :env option for run-program
+    * Maximum dynamic-space-size on Linux reduced to 1530 MB because
+      that's the largest available space on 32-bit Ubuntu 11.10.
 
   * ANSI compliance fixes:
     * PATHNAME-MATCH-P did not accept search-lists.