diff --git a/ChangeLog b/ChangeLog
index 0d69b94943e..62847460778 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,6 @@
 2011-07-06  Paul Eggert  <eggert@cs.ucla.edu>
 
-	Add gnulib support for pthread_sigmask.
+	Add gnulib support for pthread_sigmask (Bug#9010).
 	* Makefile.in (GNULIB_MODULES): Add pthread_sigmask.
 	(GNULIB_TOOL_FLAGS): Avoid sigprocmask.  Emacs does its own
 	implementation of 'sigprocmask' on Windows, and it assumes
diff --git a/src/ChangeLog b/src/ChangeLog
index 9c73cb9ed85..41dd4c0e9c1 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,6 +1,6 @@
 2011-07-06  Paul Eggert  <eggert@cs.ucla.edu>
 
-	Use pthread_sigmask, not sigprocmask.
+	Use pthread_sigmask, not sigprocmask (Bug#9010).
 	* callproc.c (Fcall_process):
 	* sysdep.c (sys_sigblock, sys_sigunblock, sys_sigsetmask):
 	* process.c (create_process):