adding some search notes

diff --git a/documentation/search.txt b/documentation/search.txt
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+# Basic search
+It works on the defined default search field for each collection.
+The field will be searched with the mysql full text search.
+
+# Adwanced search
+It combines the mysql full text search with some added functionality as described in the
+advanced search view.
+
+# Search limitations
+The search is a mysql full text search.
+This has some limitations. Noticable will be the stopwords. Like searching for "what" will return nothing.
+https://dev.mysql.com/doc/refman/8.0/en/fulltext-search.html
+https://dev.mysql.com/doc/refman/8.0/en/fulltext-stopwords.html
+https://dev.mysql.com/doc/refman/8.0/en/fulltext-restrictions.html