bindings/erlang: Added copyright and license header.

[collectd.git] / src / collectd-exec.pod

diff --git a/src/collectd-exec.pod b/src/collectd-exec.pod
index d935c70..81b3a2e 100644 (file)
--- a/src/collectd-exec.pod
+++ b/src/collectd-exec.pod
@@ -83,7 +83,7 @@ plugin within collectd. I<type> identifies the type and number of values
 data-sets is available in the B<types.db> file. See L<types.db(5)> for a
 description of the format of this file.
 
-The I<OptionList> is an optional list of I<Options>, where each option if a
+The I<OptionList> is an optional list of I<Options>, where each option is a
 key-value-pair. A list of currently understood options can be found below, all
 other options will be ignored. Values that contain spaces must be quoted with
 double quotes.
@@ -230,6 +230,23 @@ associated with a certain value.
 
 =back
 
+=head1 ENVIRONMENT
+
+The following environment variables are set by the plugin before calling
+I<exec>:
+
+=over 4
+
+=item COLLECTD_INTERVAL
+
+Value of the global interval setting.
+
+=item COLLECTD_HOSTNAME
+
+Hostname used by I<collectd> to dispatch local values.
+
+=back
+
 =head1 USING NAGIOS PLUGINS
 
 Though the interface is far from perfect, there are tons of plugins for Nagios.