diff --git a/Gemfile.lock b/Gemfile.lock
index f7f0c59..7ebd19a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,34 +10,40 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.5.0)
-      public_suffix (~> 2.0, >= 2.0.2)
-    chunky_png (1.3.8)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    chunky_png (1.3.11)
     color (1.8)
-    css_parser (1.4.9)
+    css_parser (1.7.1)
       addressable
-    excon (0.55.0)
-    json (1.8.3)
-    pdf-core (0.6.1)
-    prawn (2.1.0)
-      pdf-core (~> 0.6.1)
-      ttfunk (~> 1.4.0)
-    prawn-svg (0.26.0)
-      css_parser (~> 1.3)
+    excon (0.73.0)
+    json (2.3.0)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    pdf-core (0.7.0)
+    prawn (2.2.2)
+      pdf-core (~> 0.7.0)
+      ttfunk (~> 1.5)
+    prawn-svg (0.30.0)
+      css_parser (~> 1.6)
       prawn (>= 0.11.1, < 3)
-    public_suffix (2.0.5)
-    rack (1.6.5)
-    rack-protection (1.5.3)
+    public_suffix (4.0.5)
+    rack (2.2.2)
+    rack-protection (2.0.8.1)
       rack
-    rmagick (2.16.0)
-    rqrcode (0.10.1)
+    rmagick (4.1.2)
+    rqrcode (1.1.2)
       chunky_png (~> 1.0)
-    sinatra (1.4.8)
-      rack (~> 1.5)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
-    tilt (2.0.6)
-    ttfunk (1.4.0)
+      rqrcode_core (~> 0.1)
+    rqrcode_core (0.1.2)
+    ruby2_keywords (0.0.2)
+    sinatra (2.0.8.1)
+      mustermann (~> 1.0)
+      rack (~> 2.0)
+      rack-protection (= 2.0.8.1)
+      tilt (~> 2.0)
+    tilt (2.0.10)
+    ttfunk (1.6.2.1)
 
 PLATFORMS
   ruby
@@ -53,4 +59,4 @@ DEPENDENCIES
   sinatra
 
 BUNDLED WITH
-   1.11.2
+   1.17.2
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..bf4c5c4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+# spejstore-labelmaker
+
+```sh
+bundle install
+bundle exec ruby main.rb
+```
+
+try it out:
+
+GET http://localhost:4567/api/1/preview/:label.png
+GET http://localhost:4567/api/1/preview/:label.pdf
+POST http://localhost:4567/api/1/print/:label
+
+where :label is a `spejstore` label.id or item.short_id