diff --git a/dataset.go b/dataset.go
index 80eb483..205793c 100644
--- a/dataset.go
+++ b/dataset.go
@@ -71,6 +71,8 @@ type Dataset struct {
 	PreviousPath string `json:"previousPath,omitempty"`
 	// ProfileID of dataset owner, transient
 	ProfileID string `json:"profileID,omitempty"`
+	// Number of versions this dataset has, transient
+	NumVersions int `json:"numVersions,omitempty"`
 	// Qri is a key for both identifying this document type, and versioning the
 	// dataset document definition itself.
 	Qri string `json:"qri"`
@@ -132,6 +134,7 @@ func (ds *Dataset) DropTransientValues() {
 	ds.Name = ""
 	ds.Path = ""
 	ds.ProfileID = ""
+	ds.NumVersions = 0
 }
 
 var (
diff --git a/dataset_test.go b/dataset_test.go
index 1a7d069..e2789a8 100644
--- a/dataset_test.go
+++ b/dataset_test.go
@@ -9,7 +9,32 @@ import (
 )
 
 func TestDatasetDropTransientValues(t *testing.T) {
-	t.Log("TODO (b5)")
+	ds := Dataset{
+		Body: []int{1,2,3},
+		Name: "three numbers",
+		Path: "/tmp/ds",
+		ProfileID: "QmBlahBlah",
+		NumVersions: 4,
+	}
+	ds.DropTransientValues()
+	if !ds.IsEmpty() {
+		t.Errorf("error, dropping transient values should leave an empty dataset")
+	}
+
+	ds = Dataset{
+		Body: []int{1,2,3},
+		Name: "three numbers",
+		Path: "/tmp/ds",
+		ProfileID: "QmBlahBlah",
+		NumVersions: 4,
+		Meta: &Meta{
+			Title: "a title",
+		},
+	}
+	ds.DropTransientValues()
+	if ds.IsEmpty() {
+		t.Errorf("error dataset should not be empty")
+	}
 }
 
 func TestDatasetOpenBodyFile(t *testing.T) {