diff --git a/src/rpn.rs b/src/rpn.rs
index cadffa2..eede26b 100644
--- a/src/rpn.rs
+++ b/src/rpn.rs
@@ -57,7 +57,7 @@ extern crate sysexits;
 use sysexits::EX_DATAERR;
 
 #[derive(Clone, Copy, PartialEq, PartialOrd, Debug)]
-// enum CalcType is a type containing operations used in the calculator.
+// enum CalcType is a type containing operations used in the calculator
 enum CalcType {
 	Add,
 	Subtract,