diff --git a/src/call.rs b/src/call.rs
index 6ca6028b..87dcaefb 100644
--- a/src/call.rs
+++ b/src/call.rs
@@ -52,7 +52,7 @@ pub struct SessionDescription<'a> {
     sdp: &'a str,
 }
 
-/// The types of VoIP session descriptions.
+/// The type of VoIP session description.
 pub enum SessionDescriptionType {
     /// An answer.
     Answer,