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diff --git a/README.md b/README.md
index 2747d59..18cae80 100644
--- a/README.md
+++ b/README.md
@@ -19,5 +19,11 @@ Install a real operating system and try again.
 If `help2man` is installed you can generate a manpage by running `make man`.
 For full instruction see `man ./spl.1` or run `./spl --help`.
 
+## Fun
+You can verify the parser and pretty printer by running:
+```
+diff -s <(./spl examples/example.spl | ./spl) <(./spl examples/example.spl)
+```
+
 ## `LICENCE`
 See `LICENCE` file.