diff --git a/api/lib_test.go b/api/lib_test.go
index 37137956..da661924 100644
--- a/api/lib_test.go
+++ b/api/lib_test.go
@@ -1425,11 +1425,11 @@ func TestCallCallablePoint(t *testing.T) {
 			Type: "ty1",
 			Attributes: types.EventAttributes{
 				types.EventAttribute{
-					Key: "alice",
+					Key:   "alice",
 					Value: "101010",
 				},
 				types.EventAttribute{
-					Key: "bob",
+					Key:   "bob",
 					Value: "42",
 				},
 			},
@@ -1438,11 +1438,11 @@ func TestCallCallablePoint(t *testing.T) {
 			Type: "ty2",
 			Attributes: types.EventAttributes{
 				types.EventAttribute{
-					Key: "ALICE",
+					Key:   "ALICE",
 					Value: "42",
 				},
 				types.EventAttribute{
-					Key: "BOB",
+					Key:   "BOB",
 					Value: "101010",
 				},
 			},
@@ -1484,11 +1484,11 @@ func TestCallCallablePoint(t *testing.T) {
 	require.NoError(t, err)
 	attrsIn := types.EventAttributes{
 		types.EventAttribute{
-			Key: "alice",
+			Key:   "alice",
 			Value: "42",
 		},
 		types.EventAttribute{
-			Key: "bob",
+			Key:   "bob",
 			Value: "101010",
 		},
 	}
diff --git a/lib_test.go b/lib_test.go
index 21e46727..95f43fba 100644
--- a/lib_test.go
+++ b/lib_test.go
@@ -313,11 +313,11 @@ func TestCallCallablePoint(t *testing.T) {
 			Type: "ty1",
 			Attributes: types.EventAttributes{
 				types.EventAttribute{
-					Key: "alice",
+					Key:   "alice",
 					Value: "101010",
 				},
 				types.EventAttribute{
-					Key: "bob",
+					Key:   "bob",
 					Value: "42",
 				},
 			},
@@ -326,11 +326,11 @@ func TestCallCallablePoint(t *testing.T) {
 			Type: "ty2",
 			Attributes: types.EventAttributes{
 				types.EventAttribute{
-					Key: "ALICE",
+					Key:   "ALICE",
 					Value: "42",
 				},
 				types.EventAttribute{
-					Key: "BOB",
+					Key:   "BOB",
 					Value: "101010",
 				},
 			},
@@ -359,11 +359,11 @@ func TestCallCallablePoint(t *testing.T) {
 	require.NoError(t, err)
 	attrsIn := types.EventAttributes{
 		types.EventAttribute{
-			Key: "alice",
+			Key:   "alice",
 			Value: "42",
 		},
 		types.EventAttribute{
-			Key: "bob",
+			Key:   "bob",
 			Value: "101010",
 		},
 	}
diff --git a/libwasmvm/src/api.rs b/libwasmvm/src/api.rs
index 883a31ae..2ecbb531 100644
--- a/libwasmvm/src/api.rs
+++ b/libwasmvm/src/api.rs
@@ -31,6 +31,8 @@ const MAX_REGIONS_LENGTH_OUTPUT: usize = 64 * MI;
 pub struct api_t {
     _private: [u8; 0],
 }
+
+// TODO: will be removed after solving cosmwasm#273
 // This contains property about the function of callee
 #[derive(Serialize, Deserialize)]
 struct CalleeProperty {
@@ -150,6 +152,7 @@ impl BackendApi for GoApi {
         (result, gas_info)
     }
 
+    // TODO: will be removed after solving cosmwasm#273
     fn contract_call<A, S, Q>(
         &self,
         caller_env: &Environment<A, S, Q>,
@@ -330,6 +333,7 @@ impl BackendApi for GoApi {
         (call_ret, gas_info)
     }
 
+    // TODO: will be removed after solving cosmwasm#273
     fn get_wasmer_module(&self, contract_addr: &str) -> BackendResult<Module> {
         let cache_t_null_ptr: *mut cache_t = std::ptr::null_mut();
         let mut error_msg = UnmanagedVector::default();
@@ -399,6 +403,7 @@ fn into_backend(db: Db, api: GoApi, querier: GoQuerier) -> Backend<GoApi, GoStor
     }
 }
 
+// TODO: will be removed after solving cosmwasm#273
 fn get_read_write_permission(
     callee_instance: &mut Instance<GoApi, GoStorage, GoQuerier>,
     is_caller_permission: bool,