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--- a/src/python/samples/rcldlkp.py
+++ b/src/python/samples/rcldlkp.py
@@ -1,5 +1,8 @@
 #!/usr/bin/env python
 __doc__ = """
+An exemple indexer for an arbitrary multi-document file format.
+Not supposed to run ''as-is'' or be really useful.
+
 ''Lookup'' notes file indexing
 
 The file format has text notes separated by lines with a single '%' character