diff --git a/internal/state/execution.go b/internal/state/execution.go
index 7010010da..4f02092d5 100644
--- a/internal/state/execution.go
+++ b/internal/state/execution.go
@@ -158,11 +158,6 @@ func (blockExec *BlockExecutor) CreateProposalBlock(
 			blockExec.logger.Debug("error removing transaction from the mempool", "error", err, "tx hash", rtx.Hash())
 		}
 	}
-	for _, atx := range txrSet.AddedTxs() {
-		if err := blockExec.mempool.CheckTx(ctx, atx, nil, mempool.TxInfo{}); err != nil {
-			blockExec.logger.Error("error adding tx to the mempool", "error", err, "tx hash", atx.Hash())
-		}
-	}
 	itxs := txrSet.IncludedTxs()
 	return state.MakeBlock(height, itxs, commit, evidence, proposerAddr), nil
 }
diff --git a/internal/state/execution_test.go b/internal/state/execution_test.go
index 6f2c7e87c..58580e7be 100644
--- a/internal/state/execution_test.go
+++ b/internal/state/execution_test.go
@@ -773,8 +773,7 @@ func TestPrepareProposalRemoveTxs(t *testing.T) {
 }
 
 // TestPrepareProposalAddedTxsIncluded tests that any transactions marked as ADDED
-// in the prepare proposal response are included in the block. The test also
-// ensures that any transactions added are also checked into the mempool.
+// in the prepare proposal response are included in the block.
 func TestPrepareProposalAddedTxsIncluded(t *testing.T) {
 	const height = 2
 	ctx, cancel := context.WithCancel(context.Background())
@@ -793,7 +792,6 @@ func TestPrepareProposalAddedTxsIncluded(t *testing.T) {
 	txs := factory.MakeTenTxs(height)
 	mp := &mpmocks.Mempool{}
 	mp.On("ReapMaxBytesMaxGas", mock.Anything, mock.Anything).Return(types.Txs(txs[2:]))
-	mp.On("CheckTx", mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(nil).Twice()
 
 	trs := txsToTxRecords(types.Txs(txs))
 	trs[0].Action = abci.TxRecord_ADDED
@@ -828,8 +826,6 @@ func TestPrepareProposalAddedTxsIncluded(t *testing.T) {
 	require.Equal(t, txs[1], block.Data.Txs[1])
 
 	mp.AssertExpectations(t)
-	mp.AssertCalled(t, "CheckTx", mock.Anything, types.Tx(trs[0].Tx), mock.Anything, mock.Anything)
-	mp.AssertCalled(t, "CheckTx", mock.Anything, types.Tx(trs[1].Tx), mock.Anything, mock.Anything)
 }
 
 // TestPrepareProposalReorderTxs tests that CreateBlock produces a block with transactions
diff --git a/spec/abci++/abci++_methods_002_draft.md b/spec/abci++/abci++_methods_002_draft.md
index cd7fb5961..edc7ac717 100644
--- a/spec/abci++/abci++_methods_002_draft.md
+++ b/spec/abci++/abci++_methods_002_draft.md
@@ -378,7 +378,7 @@ and _p_'s _validValue_ is `nil`:
       `ResponsePrepareProposal.validator_updates`, and `ResponsePrepareProposal.consensus_param_updates`.
     * in both modes, the Application can manipulate transactions
         * leave transactions untouched - `TxAction = UNMODIFIED`
-        * add new transactions (not previously in the mempool) - `TxAction = ADDED`
+        * add new transactions directly to the proposal - `TxAction = ADDED`
         * remove transactions (invalid) from the proposal and from the mempool - `TxAction = REMOVED`
         * remove transactions from the proposal but not from the mempool (effectively _delaying_ them) - the
           Application removes the transaction from the list
@@ -840,7 +840,7 @@ enum TxAction {
 * **Usage**:
     * If `Action` is `UNKNOWN`, a problem happened in the Application. Tendermint will assume the application is faulty and crash.
     * If `Action` is `UNMODIFIED`, Tendermint includes the transaction in the proposal. Nothing to do on the mempool.
-    * If `Action` is `ADDED`, Tendermint includes the transaction in the proposal. The transaction is also added to the mempool and gossipped.
+    * If `Action` is `ADDED`, Tendermint includes the transaction in the proposal. The transaction is _not_ added to the mempool.
     * If `Action` is `REMOVED`, Tendermint excludes the transaction from the proposal. The transaction is also removed from the mempool if it exists,
       similar to `CheckTx` returning _false_.
 ### TxRecord
diff --git a/types/tx.go b/types/tx.go
index 2dd7d3a51..b81114452 100644
--- a/types/tx.go
+++ b/types/tx.go
@@ -159,11 +159,6 @@ func (t TxRecordSet) IncludedTxs() []Tx {
 	return t.included
 }
 
-// AddedTxs returns the transactions added by the application.
-func (t TxRecordSet) AddedTxs() []Tx {
-	return t.added
-}
-
 // RemovedTxs returns the transactions marked for removal by the application.
 func (t TxRecordSet) RemovedTxs() []Tx {
 	return t.removed