diff --git a/education/computer engineering/ECE2700/Binary Logic.md b/education/computer engineering/ECE2700/Binary Logic.md
index c1dd14f..d663ecc 100644
--- a/education/computer engineering/ECE2700/Binary Logic.md	
+++ b/education/computer engineering/ECE2700/Binary Logic.md	
@@ -80,4 +80,16 @@ An XOR operation is expressed using a circle around an addition symbol:
 $$ y = x_1 \oplus x_2 $$
 
 ## XNOR Gate
-An XNOR gate is on 
+An XNOR gate is on if neither input is enabled, or both inputs are enabled.
+
+## Truth Table
+
+| $x_1$ | $x_2$ | $y$ |
+| ----- | ----- | --- |
+| 0     | 0     | 1   |
+| 0     | 1     | 0   |
+| 1     | 0     | 0   |
+| 1     | 1     | 1   |
+## Mathematical Expression
+An XNOR operation is expressed using a bar over an XOR operation:
+$$ y = \overline{x_1 \oplus x_2} $$