@@ -210,10 +210,9 @@ drivers: `aufs`, `devicemapper`, `btrfs`, `zfs`, `overlay` and `overlay2`.

 The `aufs` driver is the oldest, but is based on a Linux kernel patch-set that

 is unlikely to be merged into the main kernel. These are also known to cause

-some serious kernel crashes. However, `aufs` is also the only storage driver

-that allows containers to share executable and shared library memory, so is a

-useful choice when running thousands of containers with the same program or

-libraries.

+some serious kernel crashes. However, `aufs` allows containers to share

+executable and shared library memory, so is a useful choice when running

+thousands of containers with the same program or libraries.

 The `devicemapper` driver uses thin provisioning and Copy on Write (CoW)

 snapshots. For each devicemapper graph location – typically

@@ -235,7 +234,10 @@ cached only once. Use `dockerd -s zfs`. To select a different zfs filesystem

 set `zfs.fsname` option as described in [Storage driver options](#storage-driver-options).

 The `overlay` is a very fast union filesystem. It is now merged in the main

-Linux kernel as of [3.18.0](https://lkml.org/lkml/2014/10/26/137). Call

+Linux kernel as of [3.18.0](https://lkml.org/lkml/2014/10/26/137). `overlay`

+also supports page cache sharing, this means multiple containers accessing

+the same file can share a single page cache entry (or entries), it makes

+`overlay` as efficient with memory as `aufs` driver. Call

 `dockerd -s overlay` to use it.

 > **Note:**