diff --git a/pmd/ReadMe.txt b/pmd/ReadMe.txt
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+++ b/pmd/ReadMe.txt
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+How to build PMD ?
+==================
+
+Simply use maven: $ mvn compile
+
+PMD now uses a small plugin to generate its website, so if you want to build the
+website ($ mvn site), you'll need to install it:
+
+$ cd ../maven-plugin-pmd-build
+$ mvn clean install
+
+That's all !