From 'apt-checkpoint --help':
---snip---
-cCLEAN, --clean=CLEAN
Erase checkpoints more than n
days old
---snip---
Parameter 'CLEAN' unexplained; Explanation calls for a
parameter 'n' not mentioned in the usage description.
Recomend changing to 'Erase ckeckpoints more then CLEAN
days old'.
2004-05-25 02:35:55 UTC in apt-checkpoint