diff --git a/src/header/mod.rs b/src/header/mod.rs
index 7d791c7b..6b98d324 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -40,7 +40,7 @@ pub trait IntoHeaderValue: Sized {
     /// The type returned in the event of a conversion error.
     type Error: Into<HttpError>;
 
-    /// Cast from PyObject to a concrete Python object type.
+    /// Try to convert value to a Header value.
     fn try_into(self) -> Result<HeaderValue, Self::Error>;
 }