diff --git a/compiler/rustc_middle/src/ty/mod.rs b/compiler/rustc_middle/src/ty/mod.rs
index 637ef4c17ebc8..492afa54445bc 100644
--- a/compiler/rustc_middle/src/ty/mod.rs
+++ b/compiler/rustc_middle/src/ty/mod.rs
@@ -2675,7 +2675,7 @@ impl<'tcx> ClosureKind {
         }
     }
 
-    /// Returns `true` if this a type that impls this closure kind
+    /// Returns `true` if a type that impls this closure kind
     /// must also implement `other`.
     pub fn extends(self, other: ty::ClosureKind) -> bool {
         match (self, other) {