diff --git a/engine/userguide/storagedriver/device-mapper-driver.md b/engine/userguide/storagedriver/device-mapper-driver.md
index b32864e783..d70f87fb7e 100644
--- a/engine/userguide/storagedriver/device-mapper-driver.md
+++ b/engine/userguide/storagedriver/device-mapper-driver.md
@@ -165,6 +165,7 @@ following distributions support the driver:
 * Ubuntu 12.04
 * Ubuntu 14.04
 * Debian
+* Arch Linux
 
 Docker hosts running the `devicemapper` storage driver default to a
 configuration mode known as `loop-lvm`. This mode uses sparse files to build
@@ -471,7 +472,7 @@ The `Data Space` values show that the pool is 100GB total. This example extends
    -rw------- 1 root root 2.0G Mar 31 11:17 metadata
    ```
 
-2. Truncate `data` file to the size of the `metadata` file (approximage 200GB).
+2. Truncate `data` file to the size of the `metadata` file (approximately 200GB).
 
    ```bash
    $ sudo truncate -s 214748364800 /var/lib/docker/devicemapper/devicemapper/data
@@ -684,4 +685,4 @@ data volumes.
 * [Select a storage driver](selectadriver.md)
 * [AUFS storage driver in practice](aufs-driver.md)
 * [Btrfs storage driver in practice](btrfs-driver.md)
-* [daemon reference](../../reference/commandline/dockerd.md#storage-driver-options)
\ No newline at end of file
+* [daemon reference](../../reference/commandline/dockerd.md#storage-driver-options)