diff --git a/README.md b/README.md
index 8efebd3..1b00aaa 100644
--- a/README.md
+++ b/README.md
@@ -13,3 +13,29 @@ Omnidirectional camera calibration implementation c++
 - mkdir build
 - cd build
 - cmake ..
+- make -j8
+
+### Usage
+- cd build
+- ./ocam-fisheye-calib -w=6 -h=8 -s=24 -o=camera.xml -op -oe -su imagelist.xml
+- Parameters:
+   - -w=<board_width>         : the number of inner corners per one of board dim
+   - -h=<board_height>        : the number of inner corners per another board dimension
+   - [-pt=<pattern>]          : the type of pattern: chessboard or circles' grid
+   - [-n=<number_of_frames>]  : the number of frames to use for calibration (if not specified, it will be set to the number of board views actually available)
+   - [-d=<delay>]             : a minimum delay in ms between subsequent attempts to capture a next view (used only for video capturing)
+   - [-s=<squareSize>]        : square size in some user-defined units (1 by default)
+   - [-o=<out_camera_params>] : the output filename for intrinsic [and extrinsic] parameters
+   - [-op]                    : write detected feature points
+   - [-oe]                    : write extrinsic parameters
+   - [-zt]                    : assume zero tangential distortion
+   - [-a=<aspectRatio>]       : fix aspect ratio (fx/fy)
+   - [-p]                     : fix the principal point at the center
+   - [-v]                     : flip the captured images around the horizontal axis
+   - [-V]                     : use a video file, and not an image list, uses [input_data] string for the video file name
+   - [-su]                    : show undistorted images after calibration
+   - [input_data]             : input data, one of the following: 
+      - text file with a list of the images of the board the text file can be generated with imagelist_creator
+      - name of video file with a video of the board if input_data not specified, a live view from the camera is used
+   
+