README.md in reveal-jekyll-0.0.3 vs README.md in reveal-jekyll-0.0.4

- old
+ new

@@ -81,9 +81,20 @@
   theme: "black" # beige/blood/league/moon/night/serif/simple/sky/solarized/white
 ```
 
 You can set globally the transitions and theme of your presentation.
 
+### Export presentation
+
+To export the presentation use `?print-pdf` at the end of the url to be able to save the page as PDF:
+
+```
+<url>:<port>/<base url>/?print-pdf
+```
+
+Try it at https://sylhare.github.io/Reveal-Jekyll/?print-pdf
+
+
 ### Use as a gem
 
 There is a `Dockerfile` available, check it out to see how to use the theme in a Docker.
 Basically you need 4 things to make it work as a gem:
 