diff --git a/education/computer engineering/ECE2700/Digital Hardware.md b/education/computer engineering/ECE2700/Digital Hardware.md
index 7d40ae8..e8b9c9c 100644
--- a/education/computer engineering/ECE2700/Digital Hardware.md	
+++ b/education/computer engineering/ECE2700/Digital Hardware.md	
@@ -21,6 +21,7 @@ In base 10, a value is expressed by an n-tuple with n digits
 $$ D = d_{n-1}d_{n-2} \cdots d_1 d_0 $$
 This represents the value
 $$ V(D) = d_{n-1} * 10^{n-1} + d_{n - 2} * 10^{n-2} + \cdots + d_1 * 10^1 + d_0 * 10^0 $$
+In a binary or base 2 number system, each digit can be a zero or one, called a *bit*. 
 
 # Definitions
 - **Xtor** is an abbreviation for *transistor*