Updated readme

README.md

@@ -1,3 +1,21 @@
 # moinmoin-scripts
 
-helper scripts for our [MoinMoin](https://moinmo.in/) deployment
+Helper scripts for our [MoinMoin](https://moinmo.in/) deployment.
+
+
+### install-xapian.sh
+
+The full text search indexing is provided by Xapian(https://xapian.org/). Since
+our MoinMoin installation is done in a [virtual environment](https://docs.python.org/3/glossary.html#term-virtual-environment)
+we can't use the system provided installer package.
+
+For an easy build and update process, the script `install-xapian.sh` can be
+used, but the virtual environment must be [activated first](https://wiki.cpi.imtek.uni-freiburg.de/CPIvServerDocumentation/MoinMoinWikis#Full_Text_Indexing_with_Xapian).
+
+
+### rebuild-search-index.py
+
+This scirpt rebuilds the full text search index. This might be needed if a
+search setting in one of the configuration files was changed. Since MoinMoin
+rebuilds the search index by each wiki, this scripts helps to automate the
+process for all wikis in one go.