diff --git a/zebra-state/src/service/memory_state/non_finalized_state.rs b/zebra-state/src/service/memory_state/non_finalized_state.rs
index 71a9b90e..4545a58b 100644
--- a/zebra-state/src/service/memory_state/non_finalized_state.rs
+++ b/zebra-state/src/service/memory_state/non_finalized_state.rs
@@ -263,7 +263,7 @@ mod tests {
             zebra_test::vectors::BLOCK_MAINNET_419201_BYTES.zcash_deserialize_into()?;
         let block1: Arc<Block> =
             zebra_test::vectors::BLOCK_MAINNET_419200_BYTES.zcash_deserialize_into()?;
-        // Create a random block which will have a much worse difficulty hash
+        // Create a random block which will have a much worse difficulty threshold
         // than an intentionally mined block from the mainnet
         let child = block1.make_fake_child();