diff --git a/README.markdown b/README.markdown
index 4f06651..9fa4c38 100644
--- a/README.markdown
+++ b/README.markdown
@@ -14,11 +14,34 @@ This module is officially curated and provided by Puppet Labs.  The modules
 Puppet Labs writes and distributes will make heavy use of this standard
 library.
 
+# Versions #
+
+This module follows semver.org (v1.0.0) versioning guidelines.  The standard
+library module is released as part of [Puppet
+Enterprise](http://puppetlabs.com/puppet/puppet-enterprise/) and as a result
+older versions of Puppet Enterprise that Puppet Labs still supports will have
+bugfix maintenance branches periodically "merged up" into master.  The current
+list of integration branches are:
+
+ * v2.1.x (v2.1.1 released in PE 1.2, 1.2.1, 1.2.3, 1.2.4)
+ * v2.2.x (Never released as part of PE, only to the Forge)
+ * v2.3.x (Scheduled for next PE feature release)
+ * master (mainline development branch)
+
+The first Puppet Enterprise version including the stdlib module is Puppet
+Enterprise 1.2.
+
 # Compatibility #
 
-This module is designed to work with Puppet version 2.6 and later.  It may be
-forked if Puppet 2.7 specific features are added.  There are currently no plans
-for a Puppet 0.25 standard library module.
+## stdlib v2.1.x, v2.2.x ##
+
+v2.1.x and v2.2.x of this module are designed to work with Puppet versions
+2.6.x and 2.7.x.  There are currently no plans for a Puppet 0.25 standard
+library module.
+
+## stdlib v2.3.x ##
+
+While not yet released, the standard library may only work with Puppet 2.7.x.
 
 # Functions #
 
@@ -57,4 +80,3 @@ automatically.  This is a direct copy of R.I. Pienaar's custom facter fact
 located at:
 [https://github.com/ripienaar/facter-facts/tree/master/facts-dot-d](https://github.com/ripienaar/facter-facts/tree/master/facts-dot-d)
 
-