Update README.md

hexdigest · Sep 30, 2014 · 19c2746 · 19c2746
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diff --git a/README.md b/README.md
@@ -84,3 +84,11 @@ readers[0].poll(IsoDep::Tag, Mifare::Classic::Tag, Mifare::Ultralight::Tag) do |
  end
 end
 ```
+
+Debugging
+---------
+
+To see additional debug info from libnfc run your program as follows:
+```
+LIBNFC_LOG_LEVEL=3 ruby listen.rb
+```