diff --git a/ChangeLog b/ChangeLog
index c2f3ff18e..203a21323 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,7 +1,8 @@
 Changes in version 0.2.9.10 - 2017-03-01
-  Tor 0.2.9.10 backports a security fix from later Tor release.  It also
-  includes fixes for some major issues affecting directory authorities,
-  LibreSSL compatibility, and IPv6 correctness.
+  Tor 0.2.9.10 backports a security fix for users who build Tor with
+  the --enable-expensive-hardening option. It also includes fixes for
+  some major issues affecting directory authorities, LibreSSL
+  compatibility, and IPv6 correctness.
 
   The Tor 0.2.9.x release series is now marked as a long-term-support
   series.  We intend to backport security fixes to 0.2.9.x until at
diff --git a/ReleaseNotes b/ReleaseNotes
index 9c82fe122..4c1bb3dd9 100644
--- a/ReleaseNotes
+++ b/ReleaseNotes
@@ -3,9 +3,10 @@ of Tor. If you want to see more detailed descriptions of the changes in
 each development snapshot, see the ChangeLog file.
 
 Changes in version 0.2.9.10 - 2017-03-01
-  Tor 0.2.9.10 backports a security fix from later Tor release.  It also
-  includes fixes for some major issues affecting directory authorities,
-  LibreSSL compatibility, and IPv6 correctness.
+  Tor 0.2.9.10 backports a security fix for users who build Tor with
+  the --enable-expensive-hardening option. It also includes fixes for
+  some major issues affecting directory authorities, LibreSSL
+  compatibility, and IPv6 correctness.
 
   The Tor 0.2.9.x release series is now marked as a long-term-support
   series.  We intend to backport security fixes to 0.2.9.x until at