diff --git a/README.md b/README.md
index 38a5635..c5c884e 100644
--- a/README.md
+++ b/README.md
@@ -1,31 +1,30 @@
 Checksum
 ========
 
-**Plugin for [Nextcloud](https://nextcloud.com) and [ownCloud](https://owncloud.org) to create hashes of files.**
+**App for [Nextcloud](https://nextcloud.com) to print files using the CUPS/LPR printing ecosystem.**
 
-![animation](screenshots/checksum.gif)
+![animation](screenshots/printer.gif)
 
 Installation
 ------------
 
 **Nextcloud**
 
-In your Instance, simply navigate to »Apps«, choose the category »Files«, find the Checksum app and enable it.
+You need a working CUPS setup with a compatible printer set up as the default printer and the LPR daemon installed on your server.
 
-**ownCloud**
-- Copy the checksum folder in the app directory of owncloud.
-- If not already done, rename the app-folder to "checksum" - causes overwise an sql error.
-- Enable this app in the admin interface.
+In your Instance, simply navigate to »Apps«, choose the category »Tools«, find the Printer app and enable it.
 
 Usage
 -----
 
-Just open the details view of the file (Sidebar). There should be a new tab called "Checksum". Select a algorithm and it will try to generate a hash. If you want an other algorithm, just click on the reload button. 
+Just open the details view of the file (Sidebar). There should be a new tab called "Printer". Select a Orientation of your print and it will try to ececute the LPR (Line Printing Daemon) on the CLI to send the job to a printer configured in CUPS. Currently, only the printer set as default can be used for printing.
 
-Possible algorithms are md5, sha1, sha256, sha384, sha512 and crc32.
+Possible orientations are "Landscape" and "Portrait". Further options will be added in the future.
 
 Compatibility
 -------------
 
-- I only tested the app for the current version of owncloud (9.x) and Nextcloud 10 and 11.
+- I only tested the app for the current versions of Nextcloud (14 and up).
 - I tried to use the current api as much as possible. It should be safe for future versions.
+- Currently only files supported by CUPS natively are supported for printing. This includes Images, PDFs, text files and probably others. Not all filetypes are supported by CUPS.
+- The app currently misses a lot of features that will be added in future versions of the app. If you want to help out with development, a PR is highly welcome.
diff --git a/js/printer.tabview.js b/js/printer.tabview.js
index 0a40f66..dffdd40 100644
--- a/js/printer.tabview.js
+++ b/js/printer.tabview.js
@@ -62,7 +62,7 @@
     },
 
     /**
-     * ajax callback for generating md5 hash
+     * ajax callback for printing file
      */
     check: function(fileInfo, orientation) {
       // skip call if fileInfo is null
@@ -139,7 +139,7 @@
 
   });
 
-  OCA.Printer = OCA.Primter || {};
+  OCA.Printer = OCA.Printer || {};
 
   OCA.Printer.PrinterTabView = PrinterTabView;
 
diff --git a/lib/Controller/PrinterController.php b/lib/Controller/PrinterController.php
index 7326583..956144d 100644
--- a/lib/Controller/PrinterController.php
+++ b/lib/Controller/PrinterController.php
@@ -23,12 +23,13 @@ class PrinterController extends Controller {
 		/**
 		 * callback function to get md5 hash of a file
 		 * @NoAdminRequired
-		 * @param (string) $source - filename
+		 * @param (string) $sourcefile - filename
 		 * @param (string) $orientation - Orientation of printed file
 		 */
-	  public function printfile($source, $orientation) {
-	  		if($orientation == "landscape") {
-					shell_exec('lpr ' . $source);
+	  public function printfile($sourcefile, $orientation) {
+	  		if($orientation === "landscape") {
+					$filefullpath = \OC\Files\Filesystem::getLocalFile($sourcefile);
+					exec('lpr ' . $filefullpath);
 	  			return new JSONResponse(
 							array(
 									'response' => 'success',
@@ -37,8 +38,9 @@ class PrinterController extends Controller {
 					);
 	  		}
 
-				if($orientation == "portrait"){
-					shell_exec('lpr -o orientation-requested=4 ' . $source);
+				if($orientation === "portrait"){
+					$filefullpath = \OC\Files\Filesystem::getLocalFile($sourcefile);
+					exec('lpr -o orientation-requested=4 ' . $filefullpath);
 						return new JSONResponse(
 								array(
 										'response' => 'success',
diff --git a/screenshots/printer.gif b/screenshots/printer.gif
new file mode 100644
index 0000000..b3d9a3d
Binary files /dev/null and b/screenshots/printer.gif differ