README.md in tlapse-0.3.3 vs README.md in tlapse-0.4.0

@@ -1,26 +1,41 @@
 # Tlapse
 
-Automated your time lapse photography using gphoto2.
+Automated time lapse photography using gphoto2.
 
 ## Installation
 
 1. Install gphoto2
 
-  * OSX
+  * macOS: `brew install gphoto2`
+  * Debian/Ubuntu: `sudo apt install gphoto2`
 
-    ```
-    brew install gphoto2
-    ```
+2. `gem install tlapse` or add `gem 'tlapse'` to your `Gemfile`.
 
-  * Linux
+## CLI
 
-    ```
-    sudo apt-get install gphoto2
-    ```
+Find better documentation by running `tlapse help` or `tlapse help SUBCOMMAND`
 
-2. `gem install tlapse`
+* `tlapse capture` - Capture an image using the tethered camera
 
+## API
+
+Mostly useful for cronjobs and the like.
+
+* Capture images between given hours
+  ```ruby
+  Tlapse::Capture.timelapse_command({
+    from: Time.now,
+    to: Time.now + 6.hours,
+    interval: 30.minutes
+  }) # => "gphoto2 --capture-image-and-download -I 1800 -F 12 --filename \"%Y-%m-%d_%H-%M-%S.jpg\""
+  ```
+
+* Capture images from sunset to sunrise
+  ```ruby
+  Tlapse::Capture.timelapse_command_while_sun_is_up(interval: 30.minutes)
+  # => "gphoto2 --capture-image-and-download -I 1800 -F -9"
+  ```
+
 ## License
 
 The gem is available as open source under the terms of the [MIT License](http://opensource.org/licenses/MIT).
-