diff --git a/README.md b/README.md
index b3efe5c..7532f66 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,8 @@ stdev of A_66 = 9.07
 data=dlmread('US_energy_by_sector.csv',',',2,0);
 h=figure();
 plot(data(:,1),data(:,3),data(:,1),data(:,9));
+%plotting residential energy consumption and transportational energy  
+%consumption from 1949 to 2016 in trillions of BTUs
 set(0, 'defaultAxesFontSize', 16)
 set(0,'defaultTextFontSize',14)
 set(0,'defaultLineLineWidth',3)
@@ -34,9 +36,9 @@ title('US Energy Consumption from 1949 to 2016')
 saveas(h,'figure_01.png')
 
 rescum=cumsum(data(:,3))./1000000;%cumulative sum of residential energy 
-%consumption in quintillions
+%consumption in quintillions of BTUs
 transcum=cumsum(data(:,9))./1000000;%cumulative sum of transportational 
-%energy consumption in quintillions
+%energy consumption in quintillions of BTUs
 h=figure();
 plot(data(:,1),rescum,data(:,1),transcum)
 set(gcf, 'Position', [500, 200, 1000, 800])