diff --git a/api/controllers/builds.go b/api/controllers/builds.go
index ea69b51fd4..0b16ab64bc 100644
--- a/api/controllers/builds.go
+++ b/api/controllers/builds.go
@@ -135,10 +135,22 @@ func BuildUpdate(rw http.ResponseWriter, r *http.Request) *httperr.Error {
 		return httperr.Server(err)
 	}
 
-	b.Ended = time.Now()
-	b.Manifest = r.FormValue("manifest")
-	b.Reason = r.FormValue("reason")
-	b.Status = r.FormValue("status")
+	if d := r.FormValue("description"); d != "" {
+		b.Description = d
+	}
+
+	if m := r.FormValue("manifest"); m != "" {
+		b.Manifest = m
+	}
+
+	if r := r.FormValue("reason"); r != "" {
+		b.Reason = r
+	}
+
+	if s := r.FormValue("status"); s != "" {
+		b.Status = s
+		b.Ended = time.Now()
+	}
 
 	// if build was successful create a release
 	if b.Status == "complete" && b.Manifest != "" {
@@ -146,8 +158,11 @@ func BuildUpdate(rw http.ResponseWriter, r *http.Request) *httperr.Error {
 		if err != nil {
 			return httperr.Server(err)
 		}
-	} else {
-		provider.BuildSave(b)
+	}
+
+	err = provider.BuildSave(b)
+	if err != nil {
+		return httperr.Server(err)
 	}
 
 	return RenderJson(rw, b)
diff --git a/api/manifest.yml b/api/manifest.yml
index 09436a92c3..2ff3cd3368 100644
--- a/api/manifest.yml
+++ b/api/manifest.yml
@@ -191,6 +191,48 @@ paths:
           description: not found
           schema:
             $ref: '#/definitions/error'
+    put:
+      description: Update build status
+      parameters:
+      - name: app
+        description: app name
+        type: string
+        in: path
+        required: true
+      - name: build
+        description: build id
+        type: string
+        in: path
+        required: true
+      - name: description
+        description: build description
+        type: string
+        in: formData
+        required: false
+      - name: manifest
+        description: release manifest extracted during build
+        type: string
+        in: formData
+        required: false
+      - name: reason
+        description: reason with status "failed"
+        type: string
+        in: formData
+        required: false
+      - name: status
+        description: final build status "complete" or "failed"
+        type: string
+        in: formData
+        required: false
+      responses:
+        200:
+          description: build
+          schema:
+            $ref: '#/definitions/build'
+        404:
+          description: not found
+          schema:
+            $ref: '#/definitions/error'
   /apps/{app}/environment:
     get:
       description: List environment for an app
diff --git a/api/manifest/manifest.go b/api/manifest/manifest.go
index 33e9e894dc..c98f9afb94 100644
--- a/api/manifest/manifest.go
+++ b/api/manifest/manifest.go
@@ -35,6 +35,8 @@ var (
 	Stderr       = io.Writer(os.Stderr)
 	Execer       = exec.Command
 	SignalWaiter = waitForSignal
+
+	regexValidProcessName = regexp.MustCompile(`\A[a-zA-Z0-9][-a-zA-Z0-9]{0,29}\z`) // 'web', '1', 'web-1' valid; '-', 'web_1' invalid
 )
 
 var (
@@ -157,6 +159,10 @@ func Read(dir, filename string) (*Manifest, error) {
 	}
 
 	for name, entry := range m {
+		if !regexValidProcessName.MatchString(name) {
+			return &m, fmt.Errorf("process name %q is invalid. It should contain only alphanumeric characters and dashes.", name)
+		}
+
 		for i, volume := range entry.Volumes {
 			parts := strings.Split(volume, ":")
 
@@ -218,7 +224,6 @@ func (m *Manifest) Build(app, dir string, cache bool) []error {
 	builds := map[string]string{}
 	pulls := []string{}
 	tags := map[string]string{}
-	dockerfiles := map[string]string{}
 
 	for name, entry := range *m {
 		tag := fmt.Sprintf("%s/%s", app, name)
@@ -232,21 +237,22 @@ func (m *Manifest) Build(app, dir string, cache bool) []error {
 			}
 
 			sym, err := filepath.EvalSymlinks(abs)
-
 			if err != nil {
 				return []error{err}
 			}
-			if _, ok := builds[sym]; !ok {
-				builds[sym] = randomString("convox-", 10)
+
+			df := "Dockerfile"
+			if entry.Dockerfile != "" {
+				df = entry.Dockerfile
 			}
 
-			tags[tag] = builds[sym]
+			sym = filepath.Join(sym, df)
 
-			// Dockerfile can only be specified if Build is also specified
-			if entry.Dockerfile != "" {
-				dockerfiles[sym] = entry.Dockerfile
+			if _, ok := builds[sym]; !ok {
+				builds[sym] = randomString("convox-", 10)
 			}
 
+			tags[tag] = builds[sym]
 		case entry.Image != "":
 			err := Execer("docker", "inspect", entry.Image).Run()
 
@@ -260,8 +266,9 @@ func (m *Manifest) Build(app, dir string, cache bool) []error {
 
 	errors := []error{}
 
-	for source, tag := range builds {
-		err := buildSync(source, tag, cache, dockerfiles[source])
+	for path, tag := range builds {
+		source, dockerfile := filepath.Split(path)
+		err := buildSync(source, tag, cache, dockerfile)
 
 		if err != nil {
 			return []error{err}