diff --git a/crates/light-client-verifier/src/consensus.rs b/crates/light-client-verifier/src/consensus.rs
index f4f627b..e78998f 100644
--- a/crates/light-client-verifier/src/consensus.rs
+++ b/crates/light-client-verifier/src/consensus.rs
@@ -231,7 +231,7 @@ impl<
                 ))
             }
         } else {
-            Err(Error::InvalidSingaturePeriod(
+            Err(Error::UnexpectedSingaturePeriod(
                 store_period,
                 update_signature_period,
                 "signature period must be equal to store_period or store_period+1".into(),
diff --git a/crates/light-client-verifier/src/errors.rs b/crates/light-client-verifier/src/errors.rs
index 000a3ec..2de8143 100644
--- a/crates/light-client-verifier/src/errors.rs
+++ b/crates/light-client-verifier/src/errors.rs
@@ -13,8 +13,8 @@ type BoxedTrieError = Box<TrieError<primitive_types::H256, rlp::DecoderError>>;
 
 #[derive(Debug, Display)]
 pub enum Error {
-    /// invalid signature period: `store={0} signature={1} reason={2}`
-    InvalidSingaturePeriod(SyncCommitteePeriod, SyncCommitteePeriod, String),
+    /// unexpected signature period: `store={0} signature={1} reason={2}`
+    UnexpectedSingaturePeriod(SyncCommitteePeriod, SyncCommitteePeriod, String),
     /// invalid finalized period: `store={0} finalized={1} reason={2}`
     InvalidFinalizedPeriod(SyncCommitteePeriod, SyncCommitteePeriod, String),
     /// not finalized period: `finalized={0} attested={1}`