diff --git a/src/header/common/authorization.rs b/src/header/common/authorization.rs
index ceda7ca5..97b310d7 100644
--- a/src/header/common/authorization.rs
+++ b/src/header/common/authorization.rs
@@ -167,6 +167,7 @@ impl Scheme for Basic {
     }
 }
 
+/// creates a Basic from a base-64 encoded, `:`-delimited utf-8 string
 impl FromStr for Basic {
     type Err = ::Error;
     fn from_str(s: &str) -> ::Result<Basic> {