diff --git a/ChangeLog b/ChangeLog
index d6260c8b7a..edf3475262 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,10 +6,11 @@ Changes in version 0.2.8.11 - 2016-12-??
 
   o Minor bugfixes (portability):
     - Avoid compilation errors when building on OSX Sierra. Sierra began
-      to support the getentropy() API, but created a few problems in
-      doing so. Tor 0.2.9 has a more thorough set of workarounds; in
-      0.2.8, we are just using the /dev/urandom interface. Fixes bug
-      20865. Bugfix on 0.2.8.1-alpha.
+      to support the getentropy() and clock_gettime() APIs, but created
+      a few problems in doing so. Tor 0.2.9 has a more thorough set of
+      workarounds; in 0.2.8, we are just using the /dev/urandom and mach
+      monotonic time interfaces. Fixes bug 20865. Bugfix
+      on 0.2.8.1-alpha.
 
   o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
     - Fix compilation with OpenSSL 1.1 and less commonly-used CPU