diff --git a/ChangeLog b/ChangeLog
index 4bd8578fc9..d58176667d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2017-05-03  Joseph Myers  <joseph@codesourcery.com>
+
+	* sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h (HWCAP_ASIMDRDM):
+	New macro.
+
 2017-05-02  Vladimir Mezentsev <vladimir.mezentsev@oracle.com>
 
 	[BZ #21179]
diff --git a/sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h b/sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h
index cef3225af0..117852da1c 100644
--- a/sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h
+++ b/sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h
@@ -33,3 +33,4 @@
 #define HWCAP_FPHP		(1 << 9)
 #define HWCAP_ASIMDHP		(1 << 10)
 #define HWCAP_CPUID		(1 << 11)
+#define HWCAP_ASIMDRDM		(1 << 12)