diff --git a/src/param.rs b/src/param.rs
index 376f440b..a64a2d51 100644
--- a/src/param.rs
+++ b/src/param.rs
@@ -29,8 +29,8 @@ pub mod smoothing;
 pub type FloatParam = PlainParam<f32>;
 pub type IntParam = PlainParam<i32>;
 
-/// Describes a single parmaetre of any type.
-pub trait Param {
+/// Describes a single parameter of any type.
+pub trait Param: Display {
     /// The plain parameter type.
     type Plain;