Preprocessors.md

@@ -5,6 +5,10 @@ The heart of this application is a markdown preprocessor for `pandoc` that allow
 * [preproc_wg.sh](#preproc_wgsh)
 * [preproc_staff.sh](#preproc_staffsh)
 
+Further the auxiliary routine
+* [extract_title.sh](#extract_titlesh)
+is used.
+
 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`
@@ -48,3 +52,15 @@ See the command line help for further information regarding the options or type
 ```bash
 preproc_staff.sh --help
 ```
+
+## `extract_title.sh`
+
+For a given markdown file containing the line
+```
+# Title of my topic
+```
+this routine returns
+```
+## [Title of my topic]($inputname.html)
+```
+to `stdout`
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