diff --git a/src/core/normal.rs b/src/core/normal.rs
index 59be403..d6d5cf5 100644
--- a/src/core/normal.rs
+++ b/src/core/normal.rs
@@ -14,7 +14,7 @@ impl fmt::Display for NormalOutOfRange {
     }
 }
 
-/// An `f32` value that is gauranteed to be constrained to the range of
+/// An `f32` value that is guaranteed to be constrained to the range of
 ///
 /// `0.0 >= value <= 1.0`
 ///