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diff --git a/src/collectd-nagios.1 b/src/collectd-nagios.1
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+.\" ========================================================================
+.\"
+.IX Title "COLLECTD-NAGIOS 1"
+.TH COLLECTD-NAGIOS 1 "2015-03-10" "5.4.1.805.g42e4d6c" "collectd"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+collectd\-nagios \- Nagios plugin for querying collectd
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+collectd-nagios \fB\-s\fR \fIsocket\fR \fB\-n\fR \fIvalue_spec\fR \fB\-H\fR \fIhostname\fR \fI[options]\fR
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+This small program is the glue between collectd and nagios. collectd collects
+various performance statistics which it provides via the \f(CW\*(C`unixsock plugin\*(C'\fR,
+see \fIcollectd\-unixsock\fR\|(5). This program is called by Nagios, connects to the
+\&\s-1UNIX\s0 socket and reads the values from collectd. It then returns \fB\s-1OKAY\s0\fR,
+\&\fB\s-1WARNING\s0\fR or \fB\s-1CRITICAL\s0\fR depending on the values and the ranges provided by
+Nagios.
+.SH "ARGUMENTS AND OPTIONS"
+.IX Header "ARGUMENTS AND OPTIONS"
+The following arguments and options are required and understood by
+collectd-nagios. The order of the arguments generally doesn't matter, as long
+as no argument is passed more than once.
+.IP "\fB\-s\fR \fIsocket\fR" 4
+.IX Item "-s socket"
+Path of the \s-1UNIX\s0 socket opened by collectd's \f(CW\*(C`unixsock plugin\*(C'\fR.
+.IP "\fB\-n\fR \fIvalue_spec\fR" 4
+.IX Item "-n value_spec"
+The value to read from collectd. The argument is in the form
+\&\f(CW\*(C`plugin[\-instance]/type[\-instance]\*(C'\fR.
+.IP "\fB\-H\fR \fIhostname\fR" 4
+.IX Item "-H hostname"
+Hostname to query the values for.
+.IP "\fB\-d\fR \fIdata_source\fR" 4
+.IX Item "-d data_source"
+Each \fIvalue_spec\fR may be made of multiple \*(L"data sources\*(R". With this option you
+can select one or more data sources. To select multiple data sources simply
+specify this option again. If multiple data sources are examined they are
+handled according to the consolidation function given with the \fB\-g\fR option.
+.IP "\fB\-g\fR \fBnone\fR\fI|\fR\fBaverage\fR\fI|\fR\fBsum\fR" 4
+.IX Item "-g none|average|sum"
+When multiple data sources are selected from a value spec, they can be handled
+differently depending on this option. The values of the following meaning:
+.RS 4
+.IP "\fBnone\fR" 4
+.IX Item "none"
+No consolidation if done and the warning and critical regions are applied to
+each value independently.
+.IP "\fBaverage\fR" 4
+.IX Item "average"
+The warning and critical ranges are applied to the average of all values.
+.IP "\fBsum\fR" 4
+.IX Item "sum"
+The warning and critical ranges are applied to the sum of all values.
+.IP "\fBpercentage\fR" 4
+.IX Item "percentage"
+The warning and critical ranges are applied to the ratio (in percent) of the
+first value and the sum of all values. A warning is returned if the first
+value is not defined or if all values sum up to zero.
+.RE
+.RS 4
+.RE
+.IP "\fB\-c\fR \fIrange\fR" 4
+.IX Item "-c range"
+.PD 0
+.IP "\fB\-w\fR \fIrange\fR" 4
+.IX Item "-w range"
+.PD
+Set the critical (\fB\-c\fR) and warning (\fB\-w\fR) ranges. These options mostly
+follow the normal syntax of Nagios plugins. The general format is
+"\fImin\fR\fB:\fR\fImax\fR". If a value is smaller than \fImin\fR or bigger than \fImax\fR, a
+\&\fIwarning\fR or \fIcritical\fR status is returned, otherwise the status is
+\&\fIsuccess\fR.
+.Sp
+The tilde sign (\fB~\fR) can be used to explicitly specify infinity. If \fB~\fR is
+used as a \fImin\fR value, negative infinity is used. In case of \fImax\fR, it is
+interpreted as positive infinity.
+.Sp
+If the first character of the \fIrange\fR is the at\ sign (\fB@\fR), the meaning
+of the range will be inverted. I.\ e. all values \fIwithin\fR the range will
+yield a \fIwarning\fR or \fIcritical\fR status, while all values \fIoutside\fR the range
+will result in a \fIsuccess\fR status.
+.Sp
+\&\fImin\fR (and the colon) may be omitted,
+\&\fImin\fR is then assumed to be zero. If \fImax\fR (but not the trailing colon) is
+omitted, \fImax\fR is assumed to be positive infinity.
+.IP "\fB\-m\fR" 4
+.IX Item "-m"
+If this option is given, \*(L"Not a Number\*(R" (NaN) is treated as \fIcritical\fR. By
+default, the \fInone\fR consolidation reports NaNs as \fIwarning\fR. Other
+consolidations simply ignore NaN values.
+.SH "RETURN VALUE"
+.IX Header "RETURN VALUE"
+As usual for Nagios plugins, this program writes a short, one line status
+message to \s-1STDOUT\s0 and signals success or failure with it's return value. It
+exits with a return value of \fB0\fR for \fIsuccess\fR, \fB1\fR for \fIwarning\fR and \fB2\fR
+for \fIcritical\fR. If the values are not available or some other error occurred,
+it returns \fB3\fR for \fIunknown\fR.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIcollectd\fR\|(1),
+\&\fIcollectd.conf\fR\|(5),
+\&\fIcollectd\-unixsock\fR\|(5),
+<http://nagios.org/>
+.SH "AUTHOR"
+.IX Header "AUTHOR"
+Florian Forster <octo\ at\ collectd.org>