diff --git a/README.md b/README.md
index ca2ad0c..41868e2 100644
--- a/README.md
+++ b/README.md
@@ -1,21 +1,22 @@
 # slideshow
 
-a simple cli application 
+a simple cli application to start a background image slideshow using 'feh'.
 
 ## requirements
 
-- [ImageMagick](https://imagemagick.org/)
 - [feh](https://feh.finalrewind.org/)
+- [ImageMagick](https://imagemagick.org/) (optional)
 
 ## configuration
 
 configuration is entirely done via environment variables.
 
-| variable             | default           | description                               |
-| SLIDESHOW_INTERVAL   | 60                | the interval of the slideshow in seconds  |
-| SLIDESHOW_DIRECTORY  | "$HOME"           | path to a directory containing images     | 
+| variable             | default           | description                                                |
+| -------------------- | ----------------- | -----------------------------------------------------------|
+| SLIDESHOW_INTERVAL   | 60                | the interval of the slideshow in seconds                   |
+| SLIDESHOW_DIRECTORY  | "$HOME"           | path to a directory containing images                      | 
 | SLIDESHOW_RESOLUTION |                   | the resolution to which images are scaled (i.e. 1920x1080) | 
-| SLIDESHOW_LOGLEVEL   | "info"            | the log level                             |
+| SLIDESHOW_LOGLEVEL   | "info"            | the log level                                              |
 
 **note:**
 if no resolution is set the images will be displayed as they are (without any scaling).