diff --git a/zebra-consensus/src/checkpoint/list.rs b/zebra-consensus/src/checkpoint/list.rs
index f537f0a8..4f7d07c7 100644
--- a/zebra-consensus/src/checkpoint/list.rs
+++ b/zebra-consensus/src/checkpoint/list.rs
@@ -67,7 +67,7 @@ impl CheckpointList {
         Ok(CheckpointList(checkpoints))
     }
 
-    /// Return true if there a checkpoint at `height`.
+    /// Return true if there is a checkpoint at `height`.
     ///
     /// See `BTreeMap::contains_key()` for details.
     pub fn contains(&self, height: BlockHeight) -> bool {