diff --git a/protobuf/profit_contract.proto b/protobuf/profit_contract.proto
index 5a55c9f3a8..e4590d53e7 100644
--- a/protobuf/profit_contract.proto
+++ b/protobuf/profit_contract.proto
@@ -129,7 +129,7 @@ message Scheme {
     int64 profit_receiving_due_period_count = 7;
     // Whether all the schemes balance will be distributed during distribution each period.
     bool is_release_all_balance_every_time_by_default = 8;
-    // The is of the scheme.
+    // The id of the scheme.
     aelf.Hash scheme_id = 9;
     // Delay distribute period.
     int32 delay_distribute_period_count = 10;
@@ -328,4 +328,4 @@ message ProfitsClaimed {
     int64 claimer_shares = 5;
     // The total shares at the current period.
     int64 total_shares = 6;
-}
\ No newline at end of file
+}