Preprocessors.md

@@ -7,7 +7,10 @@ The heart of this application is a markdown preprocessor for `pandoc` that allow
 
 Further the auxiliary routine
 * [extract_title.sh](#extract_titlesh)
-is used.
+ist used.
+
+The main routine for preprocessing is
+* [preproc_topic.sh](#preproc_topicsh)
 
 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`
 
@@ -67,3 +70,11 @@ to `stdout`. See the command line help for further information regarding the opt
 ```bash
 extract_title.sh --help
 ```
+
+## `preproc_topic.sh`
+
+This routine calls `preproc_wg.sh` and `preproc_staff.sh`. See the command line help for further information regarding the options or type
+```bash
+preproc_topic.sh --help
+```
+****
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