Update app.py

app.py

@@ -216,10 +216,17 @@ def main() -> None:
         ],
         title='Structure Discovery with Watset',
         description='''
-**Watset** is a powerful algorithm for structure discovery in graphs.
+**Watset** is a powerful algorithm for structure discovery in undirected graphs.
 
 By capturing the ambiguity of nodes in a graph, Watset efficiently finds clusters in the input data.
 
+As the input, this tool expects [edge list](https://en.wikipedia.org/wiki/Edge_list) as a comma-separated (CSV) file without header.
+Each line of the file should contain three columns:
+
+- `source`: edge source
+- `target`: edge target
+- `weight`: edge weight
+
 Whether you're working with linguistic data or other networks, Watset is the go-to solution for unlocking hidden patterns and structures.
         ''',
         article='''