Preprocessors.md

@@ -5,7 +5,7 @@ The heart of this application is a markdown preprocessor for `pandoc` that allow
 * [preproc_wg.sh](#preproc_wgsh)
 * [preproc_staff.sh](#preproc_staffsh)
 
-The main tools for the preprocessor are regular expressions and [`sed`](https://www.gnu.org/software/sed/).
+The main tools for the preprocessor are regular expressions and [`sed`](https://www.gnu.org/software/sed/). These tools are used in order to translate `keys` for working groups or staff members into predefined values. These values are extracted from the corresponding files in  `/static`
 
 ## `preproc_wg.sh`