diff --git a/example/build.boot b/example/build.boot
index c2eaa1f..cb63cb6 100644
--- a/example/build.boot
+++ b/example/build.boot
@@ -16,8 +16,7 @@
                  [org.clojure/clojurescript      "1.7.170"]
                  [reagent                        "0.5.1"]
                  ;; [react-native-externs "0.0.1-SNAPSHOT"]
-                 ]
- )
+                 ])
 
 (require
  '[adzerk.boot-cljs             :refer  [cljs]]
@@ -74,5 +73,5 @@
   []
   (comp
    (cljs :ids #{"dist"})
-   (rn/bundle :files {"dist.js" "main.jsbundle"})
+   (rn/bundle :app-dir "app" :files {"dist.js" "main.jsbundle"})
    (target :dir ["app/dist"])))
diff --git a/src/mattsum/boot_react_native.clj b/src/mattsum/boot_react_native.clj
index c3c45a2..3fa4002 100644
--- a/src/mattsum/boot_react_native.clj
+++ b/src/mattsum/boot_react_native.clj
@@ -284,12 +284,18 @@ require('" boot-main "');
 
 (deftask bundle
   "Bundle the files specified"
-  [f files ORIGIN:TARGET {str str} "{origin target} pair of files to bundle"]
-  (let  [tmp (c/tmp-dir!)]
+  [a app-dir OUT str "The (relative) path to the React Native application"
+   p platform PLATFORM str "The platform to bundle"
+   f files ORIGIN:TARGET {str str} "{origin target} pair of files to bundle"]
+  (let [tmp (c/tmp-dir!)]
     (c/with-pre-wrap fileset
       (doseq [[origin target] files]
         (let [in  (bh/file-by-path origin fileset)
               out (clojure.java.io/file tmp target)]
           (clojure.java.io/make-parents out)
-          (bh/bundle* in out tmp)))
+          (bh/bundle* {:app-dir app-dir
+                       :platform platform
+                       :input-file in
+                       :output-file out
+                       :output-dir tmp})))
       (-> fileset (c/add-resource tmp) c/commit!))))
diff --git a/src/mattsum/impl/boot_helpers.clj b/src/mattsum/impl/boot_helpers.clj
index ce99d46..f4a6a69 100644
--- a/src/mattsum/impl/boot_helpers.clj
+++ b/src/mattsum/impl/boot_helpers.clj
@@ -57,8 +57,7 @@
          (spit out-content))
        (-> fileset
            (c/add-resource tmp)
-           ))))
-)
+           )))))
 
 (defn append-to-file
   [fileset path content replacements]
@@ -203,29 +202,31 @@
 (defn copy-file [source-path dest-path]
   (clojure.java.io/copy (clojure.java.io/file source-path) (clojure.java.io/file dest-path)))
 
-(defn bundle* [in outf outd]
-  (let [tempfname (str "nested/temp/" (java.util.UUID/randomUUID) ".js")
-        temppath (str "app/" tempfname)
+(defn bundle* [{:keys [app-dir platform input-file output-file output-dir]}]
+  (let [app-dir (or app-dir "app")
+        tempfname (str "nested/temp/" (java.util.UUID/randomUUID) ".js")
+        temppath (str app-dir "/" tempfname)
         tempdirf (->> temppath clojure.java.io/as-file .getParentFile)
-        cli (-> "app/node_modules/react-native/local-cli/cli.js"
+        cli (-> (str app-dir "/node_modules/react-native/local-cli/cli.js")
                 java.io.File.
                 .getAbsolutePath)
-        dir (-> in .getAbsoluteFile .getParent)
-        fname (-> in .getAbsolutePath)]
+        dir (-> input-file .getAbsoluteFile .getParent)
+        fname (-> input-file .getAbsolutePath)]
     (util/info "Bundling %s...\n" fname)
     ;; create nested temp directory
     ;; we need this in order to keep the react packager happy
     (util/info "Creating temp dir: %s\n" (.getAbsolutePath tempdirf))
     (.mkdirs tempdirf)
     (copy-file fname temppath)
-    (binding [util/*sh-dir* "app"]
+    (binding [util/*sh-dir* app-dir]
       (try
         (util/dosh "node" cli
-                   "bundle" "--platform" "ios"
-                   "--dev" "true"
-                   "--entry-file" tempfname
-                   "--bundle-output" (.getAbsolutePath outf)
-                   "--assets-dest" (.getAbsolutePath outd))
+          "bundle"
+          "--platform" platform
+          "--dev" "true"
+          "--entry-file" tempfname
+          "--bundle-output" (.getAbsolutePath output-file)
+          "--assets-dest" (.getAbsolutePath output-dir))
         (finally
           (util/dosh "rm" "-f" tempfname))))))