diff --git a/README.md b/README.md
index 7b30ff0..e73351c 100644
--- a/README.md
+++ b/README.md
@@ -124,6 +124,11 @@ Runs COBOL code from Node.JS side.
 #### Params
 - **Function|String|Path** `input`: A function containing a comment with inline COBOL code, the cobol code itself or a path to a COBOL file.
 - **Object** `options`: An object containing the following fields:
+ - `cwd` (String): Where the COBOL code will run (by default in the current working directory)
+ - `args` (Array): An array of strings to pass to the COBOL process.
+ - `stdin` (Stream): An optional stdin stream used to pipe data to the stdin stream of the COBOL process.
+ - `stderr` (Stream): An optional stderr stream used to pipe data to the stdin stream of the COBOL process.
+ - `stdeout` (Stream): An optional stdout stream used to pipe data to the stdin stream of the COBOL process.
 - **Function** `callback`: The callback function called with `err`, `stdout` and `stderr`.
 
 ## How to contribute
diff --git a/lib/index.js b/lib/index.js
index 2f3b32a..a065800 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -18,6 +18,13 @@ var Spawn = require("child_process").spawn
  * @function
  * @param {Function|String|Path} input A function containing a comment with inline COBOL code, the cobol code itself or a path to a COBOL file.
  * @param {Object} options An object containing the following fields:
+ *
+ *  - `cwd` (String): Where the COBOL code will run (by default in the current working directory)
+ *  - `args` (Array): An array of strings to pass to the COBOL process.
+ *  - `stdin` (Stream): An optional stdin stream used to pipe data to the stdin stream of the COBOL process.
+ *  - `stderr` (Stream): An optional stderr stream used to pipe data to the stdin stream of the COBOL process.
+ *  - `stdeout` (Stream): An optional stdout stream used to pipe data to the stdin stream of the COBOL process.
+ *
  * @param {Function} callback The callback function called with `err`, `stdout` and `stderr`.
  */
 function Cobol(input, options, callback) {