diff --git a/lnwallet/reservation.go b/lnwallet/reservation.go
index e8e157f11..7fe8d5068 100644
--- a/lnwallet/reservation.go
+++ b/lnwallet/reservation.go
@@ -302,13 +302,14 @@ func (r *ChannelReservation) TheirKeys() (*btcec.PublicKey, *btcec.PublicKey) {
 
 // CompleteFundingReservation...
 // TODO(roasbeef): add commit sig also
-func (r *ChannelReservation) CompleteReservation(theirSigs [][]byte) error {
+func (r *ChannelReservation) CompleteReservation(fundingSigs [][]byte, commitmentSig []byte) error {
 	errChan := make(chan error, 1)
 
 	r.wallet.msgChan <- &addCounterPartySigsMsg{
-		pendingFundingID: r.reservationID,
-		theirSigs:        theirSigs,
-		err:              errChan,
+		pendingFundingID:   r.reservationID,
+		theirFundingSigs:   fundingSigs,
+		theirCommitmentSig: commitmentSig,
+		err:                errChan,
 	}
 
 	return <-errChan
diff --git a/lnwallet/wallet.go b/lnwallet/wallet.go
index cc335a5a1..020c5b827 100644
--- a/lnwallet/wallet.go
+++ b/lnwallet/wallet.go
@@ -124,7 +124,11 @@ type addCounterPartySigsMsg struct {
 
 	// Should be order of sorted inputs that are theirs. Sorting is done in accordance
 	// to BIP-69: https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki.
-	theirSigs [][]byte
+	theirFundingSigs [][]byte
+
+	// This should be 1/2 of the signatures needed to succesfully spend our
+	// version of the commitment transaction.
+	theirCommitmentSig []byte
 
 	err chan error // Buffered
 }
@@ -676,7 +680,7 @@ func (l *LightningWallet) handleFundingCounterPartySigs(msg *addCounterPartySigs
 
 	// Now we can complete the funding transaction by adding their
 	// signatures to their inputs.
-	pendingReservation.theirFundingSigs = msg.theirSigs
+	pendingReservation.theirFundingSigs = msg.theirFundingSigs
 	fundingTx := pendingReservation.partialState.fundingTx
 	for i, txin := range fundingTx.TxIn {
 		if txin.SignatureScript == nil {
@@ -713,6 +717,12 @@ func (l *LightningWallet) handleFundingCounterPartySigs(msg *addCounterPartySigs
 		}
 	}
 
+	// At this point, wen calso record and verify their isgnature for our
+	// commitment transaction.
+	pendingReservation.partialState.theirCommitSig = msg.theirCommitmentSig
+	// TODO(roasbeef): verify
+	//commitSig := msg.theirCommitmentSig
+
 	// Funding complete, this entry can be removed from limbo.
 	l.limboMtx.Lock()
 	delete(l.fundingLimbo, pendingReservation.reservationID)