diff --git a/README.md b/README.md
index b68dbf1..7c251dc 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,15 @@
 
 Incident light meter app for the Gnome/Phosh Linux On Mobile ecosystem
 
+> NOTE: This app is under development and currently not working
+
+![Screenshots](doc/images/screenshot.png)
+
+Requires a phone (or tablet, or laptop) with a light sensor. If the automatic screen light setting is available on your system, it's supported.
+
+Supports the following modes:
+- Aperture priority mode: set an aperture value and the app will calculates the exposure time
+- Time priority mode: set an exposure time and the app will calculates the aperture value
+- Manual mode: set an exposure and aperture values and the app will show if the image is under/over/correctly exposed
+- Show sensor reading mode: the app will show the reading in Lux and calculate the corresponding EV value
+
diff --git a/doc/images/screenshot.png b/doc/images/screenshot.png
new file mode 100644
index 0000000..4e41d2c
Binary files /dev/null and b/doc/images/screenshot.png differ