diff --git a/devstack/libs/collectd b/devstack/libs/collectd
index 5855385..544e143 100644
--- a/devstack/libs/collectd
+++ b/devstack/libs/collectd
@@ -46,6 +46,17 @@ sudo sed -i 's|CEILOMETER_TIMEOUT.*$|CEILOMETER_TIMEOUT "'$CEILOMETER_TIMEOUT'"|
 sudo sed -i 's|OS_PASSWORD.*$|OS_PASSWORD "'$SERVICE_PASSWORD'"|g' $COLLECTD_CONF_DIR/collectd-ceilometer-plugin.conf
 sudo sed -i 's|OS_TENANT_NAME.*$|OS_TENANT_NAME "'$SERVICE_TENANT_NAME'"|g' $COLLECTD_CONF_DIR/collectd-ceilometer-plugin.conf
 
+# Configure custom units
+if [[ "$COLLECTD_CEILOMETER_UNITS" != none ]]; then
+    OIFS=$IFS
+    IFS=','
+    for UNIT in $COLLECTD_CEILOMETER_UNITS
+    do
+        sudo sed -i '/<UNITS>/a\       UNIT '"$UNIT"'' $COLLECTD_CONF_DIR/collectd-ceilometer-plugin.conf
+    done
+    IFS=$OIFS
+fi
+
 # Configure collectd logfile plugin
 if [ -n $COLLECTD_LOG_FILE ]; then
     touch $COLLECTD_LOG_FILE
diff --git a/devstack/settings b/devstack/settings
index 91edeb2..61dcc07 100644
--- a/devstack/settings
+++ b/devstack/settings
@@ -26,3 +26,6 @@ if [ -z $COLLECTD_CONF_DIR ]; then
         COLLECTD_CONF_DIR=/etc/collectd.d
     fi
 fi
+
+#Custom units feature
+COLLECTD_CEILOMETER_UNITS=${COLLECTD_CUSTOMIZE_UNITS:-none}
diff --git a/doc/source/devstackGSG.rst b/doc/source/devstackGSG.rst
index 390d599..66660c2 100644
--- a/doc/source/devstackGSG.rst
+++ b/doc/source/devstackGSG.rst
@@ -36,7 +36,10 @@ from the collectd-ceilometer-plugin repo into your devstack directory.
 
 Edit the "HOST_IP" varible to appropriately match your environment.
 
-Build your devstack environment.
+If you wish to enable any extra features please follow the instructions in the
+"Additional Features" section below before moving on to the next step.
+
+Finally, build your devstack environment.
 
 | ./stack.sh
 
@@ -52,3 +55,22 @@ this meter are being sent to ceilometer, thus confirming that collectd is
 working with ceilometer.
 
 | ceilometer sample-list --meter cpu.cpu
+
+Addtional Features
+==================
+
+Custom Units Feature
+--------------------
+
+This feature enables users to define new units for existing meter values.
+To enable this feature execute the following instructions:
+
+* To include your new units, add the following line with your chosen units to
+  your local.conf file.
+
+| COLLECTD_CEILOMETER_UNITS="<meter> <unit>"
+
+  If you would like to add more than one new unit include them in the same line
+  and seperate each meter and its unit with a comma, as shown below.
+
+| COLLECTD_CEILOMETER_UNITS="<meter> <unit>,<meter> <unit>"
\ No newline at end of file
diff --git a/doc/source/usage.rst b/doc/source/usage.rst
index 45174bc..ef463e4 100644
--- a/doc/source/usage.rst
+++ b/doc/source/usage.rst
@@ -60,6 +60,14 @@ COLLECTD_LOG_LEVEL
     this are going to be filtered out from the log file.
     Default: info
 
+
+COLLECTD_CEILOMETER_UNITS
+    (meter=unit) a comma seperated list of pairs, defining meters and their units.
+    Allows existing units to be changed and new units to be set for new meters.
+
+    Example: COLLECTD_CEILOMETER_UNITS="<meter> <unit>,<meter> <unit>"
+
+
 Authenticating using Identity Server API v3
 ===========================================
 
diff --git a/etc/collectd.conf.d/collectd-ceilometer-plugin.conf b/etc/collectd.conf.d/collectd-ceilometer-plugin.conf
index 8ae5a07..e83f1cc 100644
--- a/etc/collectd.conf.d/collectd-ceilometer-plugin.conf
+++ b/etc/collectd.conf.d/collectd-ceilometer-plugin.conf
@@ -30,5 +30,7 @@
         OS_PASSWORD "password"
         OS_TENANT_NAME "service"
 
+      <UNITS>
+      </UNITS>
     </Module>
 </Plugin>
diff --git a/releasenotes/notes/devstack-units-feature-b0db37e81a854676.yaml b/releasenotes/notes/devstack-units-feature-b0db37e81a854676.yaml
new file mode 100644
index 0000000..7e92f14
--- /dev/null
+++ b/releasenotes/notes/devstack-units-feature-b0db37e81a854676.yaml
@@ -0,0 +1,9 @@
+---
+features:
+  - Enabled the pre-existing custom units feature for DevStack
+    deployment. You can now customize the units of existing meters
+    before DevStack is deployed. This can be done for multiple
+    units at a time.
+other:
+  - Updated the devstackGSG.rst guide to provide instructions on
+    how to enable the custom units feature before DevStack is deployed.