diff --git a/README.md b/README.md
index b103466..7ec4f8e 100644
--- a/README.md
+++ b/README.md
@@ -6,10 +6,10 @@ A calculator that calculates simple interest given principal, annual rate of int
 
 ```
 Input:
-   p, principal amount
+   p, principle amount
    t, time period in years
    r, annual rate of interest
-Output
+Output:
    simple interest = p*t*r
 ```