docs: Reference the upgrade doc

Update the other documentation to reference the new upgrade doc. Signed-off-by: James O. D. Hunt <[email protected]>
clearcontainers · Sep 15, 2017 · e283610 · e283610
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diff --git a/docs/centos-installation-guide.md b/docs/centos-installation-guide.md
@@ -4,6 +4,11 @@ This document _only_ covers installing on a
 [CentOS](https://www.centos.org/) system. It explicitly does **not**
 cover installation on Red Hat* Enterprise Linux (RHEL).
 
+Note:
+
+If you are installing on a system that already has Clear Containers 2.x
+installed, first read [the upgrading document](upgrading.md).
+
 ## Required Setup
 
 The installation requires the current user to run the `sudo` command

diff --git a/docs/fedora-installation-guide.md b/docs/fedora-installation-guide.md
@@ -1,5 +1,10 @@
 # Installing Clear Containers 3.0 on Fedora
 
+Note:
+
+If you are installing on a system that already has Clear Containers 2.x
+installed, first read [the upgrading document](upgrading.md).
+
 Clear Containers **3.0** is available for Fedora\* versions **24** and **25**.
 
 This step is only required in case Docker is not installed on the system.

diff --git a/docs/ubuntu-installation-guide.md b/docs/ubuntu-installation-guide.md
@@ -1,5 +1,10 @@
 # Installing Clear Containers 3.0 on Ubuntu
 
+Note:
+
+If you are installing on a system that already has Clear Containers 2.x
+installed, first read [the upgrading document](upgrading.md).
+
 Clear Containers **3.0** is available for Ubuntu\* **16.04**.
 
 This step is only required in case Docker is not installed on the system.