diff --git a/src/experiments/algorithms/distribution_curve.py b/src/experiments/algorithms/distribution_curve.py
index f890e4a..4bda106 100644
--- a/src/experiments/algorithms/distribution_curve.py
+++ b/src/experiments/algorithms/distribution_curve.py
@@ -25,7 +25,12 @@ def calcNormalFunc(mean, sd, len):
 
 f = calcNormalFunc(mean, sd, N)
 
-plt.title("PDF: $\mu = %d$, $\sigma = %d$"%(mean, sd))    
+plt.title("PDF: $\mu = %d$, $\sigma = %d$"%(mean, sd))
+plt.vlines(sd+mean, 0, f[mean-sd], colors='orange') 
+plt.vlines(mean-sd, 0, f[mean-sd], colors='orange', label='$\sigma$')  
+plt.vlines(2*sd+mean, 0, f[mean-2*sd], colors='green') 
+plt.vlines(mean-2*sd, 0, f[mean-2*sd], colors='green', label='$2\sigma$')
+plt.legend()   
 plt.plot(f)
 plt.grid()
 plt.xlim(0, 255)