diff --git a/docs/sources/installation/centos.md b/docs/sources/installation/centos.md
index 707afc959a..7f158f9964 100644
--- a/docs/sources/installation/centos.md
+++ b/docs/sources/installation/centos.md
@@ -27,6 +27,13 @@ simply run the following command.
 
     $ sudo yum install docker
 
+## Kernel support
+
+Currently the CentOS project will only support Docker via the EPEL package when
+running on kernels shipped by the distribution. There are things like namespace
+changes which will cause issues if one decides to step outside that box and run
+non-distro kernel packages.
+
 ### Manual installation of latest version
 
 While using a package is the recommended way of installing Docker,
diff --git a/docs/sources/installation/rhel.md b/docs/sources/installation/rhel.md
index 59ab049641..70e4413564 100644
--- a/docs/sources/installation/rhel.md
+++ b/docs/sources/installation/rhel.md
@@ -40,6 +40,13 @@ You will need [RHEL
 a RHEL 6 kernel version 2.6.32-431 or higher as this has specific kernel
 fixes to allow Docker to work.
 
+## Kernel support
+
+RHEL will only support Docker via the *extras* channel or EPEL package when
+running on kernels shipped by the distribution. There are things like namespace
+changes which will cause issues if one decides to step outside that box and run
+non-distro kernel packages.
+
 ## Installation
 
 Firstly, you need to install the EPEL repository. Please follow the