diff --git a/acr/parsimony.go b/acr/parsimony.go
index fd2703b..00bd42e 100644
--- a/acr/parsimony.go
+++ b/acr/parsimony.go
@@ -15,6 +15,7 @@ const (
 	ALGO_DELTRAN = iota
 	ALGO_ACCTRAN
 	ALGO_DOWNPASS
+	ALGO_NONE
 )
 
 // Will annotate the tree nodes with ancestral characters
@@ -66,6 +67,8 @@ func ParsimonyAcr(t *tree.Tree, tipCharacters map[string]string, algo int, rando
 		parsimonyDELTRAN(t.Root(), nil, states, stateIndices, randomResolve)
 	case ALGO_ACCTRAN:
 		parsimonyACCTRAN(t.Root(), nil, states, stateIndices, randomResolve)
+	case ALGO_NONE:
+		// No pass after uppass
 	default:
 		return nil, fmt.Errorf("Parsimony algorithm %d unkown", algo)
 	}
diff --git a/asr/parsimony.go b/asr/parsimony.go
index 6bbcbef..eab903a 100644
--- a/asr/parsimony.go
+++ b/asr/parsimony.go
@@ -15,6 +15,7 @@ const (
 	ALGO_DELTRAN = iota
 	ALGO_ACCTRAN
 	ALGO_DOWNPASS
+	ALGO_NONE
 )
 
 // Will annotate the tree nodes with ancestral sequences
diff --git a/cmd/acr.go b/cmd/acr.go
index dde9427..96a1edf 100644
--- a/cmd/acr.go
+++ b/cmd/acr.go
@@ -31,6 +31,7 @@ Depending on the chosen algorithm, it will run:
    a) DOWN-PASS or
    b) DOWN-PASS+DELTRAN or
    c) ACCTRAN
+   d) NONE
 
 Should work on multifurcated trees.
 
@@ -52,6 +53,8 @@ randomly before going deeper in the tree.
 			algo = acr.ALGO_DELTRAN
 		case "downpass":
 			algo = acr.ALGO_DOWNPASS
+		case "none":
+			algo = acr.ALGO_NONE
 		default:
 			io.ExitWithMessage(fmt.Errorf("Unkown parsimony algorithm: %s", parsimonyAlgo))
 		}
diff --git a/cmd/asr.go b/cmd/asr.go
index 44089d5..98c79d6 100644
--- a/cmd/asr.go
+++ b/cmd/asr.go
@@ -34,6 +34,7 @@ Depending on the chosen algorithm, it will run:
    a) DOWN-PASS or
    b) DOWN-PASS+DELTRAN or
    c) ACCTRAN
+   d) NONE
 
 Should work on multifurcated trees
 
@@ -56,6 +57,8 @@ randomly before going deeper in the tree.
 			algo = asr.ALGO_DELTRAN
 		case "downpass":
 			algo = asr.ALGO_DOWNPASS
+		case "none":
+			algo = asr.ALGO_NONE
 		default:
 			io.ExitWithMessage(fmt.Errorf("Unkown parsimony algorithm: %s", parsimonyAlgo))
 		}