diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index f84c32f0bdf6..61f5676a7429 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -673,3 +673,11 @@ Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>
 Description:
 		(RO) the list of CPUs that are in nohz_full mode.
 		These CPUs are set by boot parameter "nohz_full=".
+
+What:		/sys/devices/system/cpu/isolated
+Date:		Apr 2015
+Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>
+Description:
+		(RO) the list of CPUs that are isolated and don't
+		participate in load balancing. These CPUs are set by
+		boot parameter "isolcpus=".