diff --git a/packages/voting-contract/src/ballots.rs b/packages/voting-contract/src/ballots.rs
index 02d4f088..34b68dfd 100644
--- a/packages/voting-contract/src/ballots.rs
+++ b/packages/voting-contract/src/ballots.rs
@@ -18,6 +18,7 @@ pub struct Ballot {
 }
 
 pub struct BallotIndexes<'a> {
+    // This PrimaryKey allows quering over all proposal ids for given voter address
     pub voter: MultiIndex<'a, Addr, Ballot, (u64, Addr)>,
 }
 
diff --git a/packages/voting-contract/src/lib.rs b/packages/voting-contract/src/lib.rs
index 335788e1..49db075e 100644
--- a/packages/voting-contract/src/lib.rs
+++ b/packages/voting-contract/src/lib.rs
@@ -1,4 +1,4 @@
-pub mod ballots;
+mod ballots;
 mod error;
 pub mod msg;
 #[cfg(test)]
@@ -377,6 +377,7 @@ pub fn list_votes_by_voter<Q: CustomQuery>(
     limit: usize,
 ) -> StdResult<VoteListResponse> {
     let voter_addr = deps.api.addr_validate(&voter)?;
+    // PrimaryKey of that IndexMap is (proposal_id, voter_address) -> (u64, Addr)
     let start = start_after.map(|m| Bound::exclusive((m, voter_addr.clone())));
 
     let votes: StdResult<Vec<_>> = ballots()