diff --git a/README.md b/README.md
index fb8f525..5a9ac9c 100644
--- a/README.md
+++ b/README.md
@@ -768,6 +768,14 @@ The name of the MySQL plugin to manage.
 
 The library file name.
 
+###Facts
+
+####`mysql_server_id`
+
+Generates a unique id, based on the node's MAC address, which can be used as
+`server_id`. This fact will *always* return `0` on all nodes which only have
+loopback interfaces. Given those nodes' connnectivity that's probably okay.
+
 ##Limitations
 
 This module has been tested on:
diff --git a/lib/facter/server_id.rb b/lib/facter/mysql_server_id.rb
similarity index 100%
rename from lib/facter/server_id.rb
rename to lib/facter/mysql_server_id.rb
diff --git a/spec/unit/facter/mysql_server_id_spec.rb b/spec/unit/facter/mysql_server_id_spec.rb
new file mode 100644
index 0000000..304890e
--- /dev/null
+++ b/spec/unit/facter/mysql_server_id_spec.rb
@@ -0,0 +1,27 @@
+require "spec_helper"
+
+describe Facter::Util::Fact do
+  before {
+    Facter.clear
+  }
+
+  describe "mysql_server_id" do
+    context "igalic's laptop" do
+      before :each do
+        Facter.fact(:macadddress).stubs(:value).returns('3c:97:0e:69:fb:e1')
+      end
+      it do
+        Facter.fact(:mysql_server_id).value.to_s.should == '72898961'
+      end
+    end
+
+    context "node with lo only" do
+      before :each do
+        Facter.fact(:macadddress).stubs(:value).returns('00:00:00:00:00:00')
+      end
+      it do
+        Facter.fact(:mysql_server_id).value.should == '0'
+      end
+    end
+  end
+end