diff --git a/NEED/analyse-NEED-EULF-2014-electricity-consumption.do b/NEED/analyse-NEED-EULF-2014-electricity-consumption.do
index 28e6d4256653cc6f7d3559a7a49409dbec10f003..a4f945de8a014da4dfec65329b839adf11ed1501 100644
--- a/NEED/analyse-NEED-EULF-2014-electricity-consumption.do
+++ b/NEED/analyse-NEED-EULF-2014-electricity-consumption.do
@@ -30,6 +30,10 @@ GNU General Public License for more details.
 
 */
 
+* if you need to use a random X% sample of the data use:
+* sample X, by(EE_BAND PROPTYPE)
+
+
 * Requires: estout
 
 clear all