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-rw-r--r--doc/plugins/sparkline.mdwn2
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diff --git a/doc/plugins/sparkline.mdwn b/doc/plugins/sparkline.mdwn
index 1b22054a6..9a5d0eb74 100644
--- a/doc/plugins/sparkline.mdwn
+++ b/doc/plugins/sparkline.mdwn
@@ -20,6 +20,8 @@ to use the plugin, you will need:
On a Debian system, this can be accomplished by installing these packages:
`libsparkline-php` `php5-gd` `php5-cli` `libdigest-sha1-perl`
+This plugin also uses the [[cpan Digest::SHA1]] perl module.
+
# examples
\[[sparkline 1 3 5 -3 10 0 width=40 height=16