diff --git a/multitree/build_vendor.sh b/multitree/build_vendor.sh
index fa1356a80..ce4cfea6d 100755
--- a/multitree/build_vendor.sh
+++ b/multitree/build_vendor.sh
@@ -15,18 +15,48 @@
 # limitations under the License.
 #
 
+function usage() {
+  cat <<EOF
+Usage: $0 -d device-name -p product-name -r dist-dir
+Builds a vendor image for given product and analyze ninja inputs.
+
+  -d  device name to build (e.g. vsoc_x86_64)
+  -p  product name to build (e.g. cf_x86_64_phone)
+  -r  directory for dist (e.g. out/dist)
+  -h  display this help and exit
+
+EOF
+  exit
+}
+
+while getopts d:p:r:h flag
+do
+    case "${flag}" in
+        d) device=${OPTARG};;
+        p) product=${OPTARG};;
+        r) dist_dir=${OPTARG};;
+        h) usage;;
+        *) usage;;
+    esac
+done
+
+if [[ -z "$device" || -z "$product" || -z "$dist_dir" ]]; then
+  echo "missing arguments"
+  usage
+fi
+
 export ALLOW_MISSING_DEPENDENCIES=true
 
 build/soong/soong_ui.bash --make-mode vendorimage collect_ninja_inputs \
-  TARGET_PRODUCT=cf_x86_64_phone TARGET_BUILD_VARIANT=userdebug
+  TARGET_PRODUCT=$product TARGET_BUILD_VARIANT=userdebug
 
-mkdir -p $DIST_DIR/soong
+mkdir -p $dist_dir/soong
 
 for f in out/*.ninja out/soong/build.ninja; do
-  gzip -c $f > $DIST_DIR/${f#out/}.gz
+  gzip -c $f > $dist_dir/${f#out/}.gz
 done
 
-cp out/target/product/vsoc_x86_64/vendor.img $DIST_DIR
+cp out/target/product/$device/vendor.img $dist_dir
 
 out/host/linux-x86/bin/collect_ninja_inputs -n prebuilts/build-tools/linux-x86/bin/ninja \
-  -f out/combined-cf_x86_64_phone.ninja -t vendorimage > $DIST_DIR/ninja_inputs.json
+  -f out/combined-$product.ninja -t vendorimage > $dist_dir/ninja_inputs.json