diff --git a/beacon_node/beacon_chain/src/light_client_server_cache.rs b/beacon_node/beacon_chain/src/light_client_server_cache.rs
index b7b6d1df18..3099c451c0 100644
--- a/beacon_node/beacon_chain/src/light_client_server_cache.rs
+++ b/beacon_node/beacon_chain/src/light_client_server_cache.rs
@@ -374,7 +374,7 @@ impl<T: BeaconChainTypes> LightClientServerCache<T> {
         let Some(current_sync_committee_branch) = store.get_sync_committee_branch(block_root)?
         else {
             return Err(BeaconChainError::LightClientBootstrapError(format!(
-                "Sync committee branch for block root {:?} not found",
+                "Sync committee branch for block root {:?} not found. This typically occurs when the block is not a finalized checkpoint. Light client bootstrap is only supported for finalized checkpoint block roots.",
                 block_root
             )));
         };