diff --git a/README.md b/README.md
index b1034661..06694ffd 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ A calculator that calculates simple interest given principal, annual rate of int
 
 ```
 Input:
-   p, principal amount
+   p, principal ammount
    t, time period in years
    r, annual rate of interest
 Output