diff --git a/Communication Systems/communication_systems.tex b/Communication Systems/communication_systems.tex
index 7e7b9a9..97b4726 100644
--- a/Communication Systems/communication_systems.tex	
+++ b/Communication Systems/communication_systems.tex	
@@ -5,7 +5,7 @@
 % @Author: Noah Huetter
 % @Date:   2019-09-24 17:26:28
 % @Last Modified by:   noah
-% @Last Modified time: 2019-10-03 15:05:52
+% @Last Modified time: 2019-10-03 15:12:55
 % ---------------------------------------------------------------------------
 
 \documentclass[a4paper, fontsize=8pt, landscape, DIV=1]{scrartcl}
@@ -368,7 +368,7 @@
         \frac{1}{2W},&-W\leq f\leq W \\
         0,& \abs{f} > W
       \end{cases} \\
-      p(t) &= \sinc(2Wt) \quad W = \frac{1}{2T_b}
+      p(t) &= \sinc(2Wt) \quad W = \frac{1}{2T_b} \quad E_b = \frac{A^2}{R_b}
   \end{empheq}
 
   \textbf{Raised Cosine Spectrum:} consists of flat portion and sinusodial rolloff.