Mention need of make-sqlitedb.py before any usage
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
diff --git a/README.rst b/README.rst
index a036a32..7388a63 100644
--- a/README.rst
+++ b/README.rst
@@ -3,7 +3,12 @@
This is an attempt to reimplement the defunct PGP pathfinder without
needing anything other than your own keyring. This is very much a work
-in progress. Currently, the following tools are available:
+in progress.
+
+Prerequisite:
+ ./make-sqlitedb.py
+
+Currently, the following tools are available:
graph-paths.py
~~~~~~~~~~~~~~
