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-rw-r--r--doc/plugins/contrib/datetime_cmp.mdwn2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/plugins/contrib/datetime_cmp.mdwn b/doc/plugins/contrib/datetime_cmp.mdwn
index ba35b37c6..47eaffaec 100644
--- a/doc/plugins/contrib/datetime_cmp.mdwn
+++ b/doc/plugins/contrib/datetime_cmp.mdwn
@@ -11,6 +11,8 @@ creation or modification times.
It also sets the date of the next modification of the page on relevant date, so
that the page will be rebuilt if the condition changes.
+It requires the DateTime::Format::Duration perl module (on Debian : ``apt-get install libdatetime-format-duration-perl``).
+
## List of functions
The list of functions is given by the following regexp: