diff --git a/education/software development/ECE1400/C.md b/education/software development/ECE1400/C.md
index f9def9d..1710738 100644
--- a/education/software development/ECE1400/C.md	
+++ b/education/software development/ECE1400/C.md	
@@ -28,6 +28,7 @@ Integers are divided into two categories, signed, and unsigned.
 If the sign bit is zero, it's a positive value, and if it's 1, the value is negative.
 
 They cal be declared using `[short|long] [signed|unsigned] int`, resulting in 6 possible combinations
+C99 adds a `long long` int
 ## Floats
 A float is a decimal value. Slower arithmetic and inexact values are both drawbacks of using floats.