diff --git a/doc/66-envfile.html b/doc/66-envfile.html
index cfb74a4780882e2110b6ad3cb8d575d2f9c5a90a..1b268ae00a665b79023cc8b10bb52627415f87b3 100644
--- a/doc/66-envfile.html
+++ b/doc/66-envfile.html
@@ -19,7 +19,7 @@
 
 	<p>
       This command is a mix of <a href="https://skarnet.org/software/s6/s6-envdir.html"><tt>s6-envdir</tt></a> and <a href="https://skarnet.org/software/execline/importas.html"><tt>importas</tt></a> <em>program</em>.
-      It reads file containing variable assignments on the given directory, adds the variables to the environment, then executes a program.
+      It reads files containing variable assignments on the given directory, adds the variables to the environment, then executes a program.
     </p>
 
 
@@ -49,10 +49,35 @@
 	<p><em>file</em> is a text file containing lines of the form <tt>key = value</tt>.Whitespace is permitted before and after <em>key</em>, and before or after <em>value</em>,
 	Quoting is also possible. 
 	</p>
-	<p>Empty lines, or lines containing only whitespace, are ignored. Lines beginning with <tt>#</tt> (possibly after some whitespace) are ignored (and typically used for comments). Comments are not possible at the end of lines:
+	<p>Empty lines, or lines containing only whitespace, are ignored. Lines beginning with <tt>#</tt> (possibly after some whitespace) are ignored (and typically used for comments). Comments are <strong>not</strong> possible at the end of lines:
 	<tt>key = value # comment</tt> is not a valid comment.
 	</p>
 	<p>Empty <em>value</em> is <strong>not</strong> permitted.</p>
-	<p>If <tt>key</tt>begin by a <tt>'!'</tt> character: <tt>!key=value</tt> the <tt>key</tt> will be removed from the environment after the substitution.</p>
+	<p>If <tt>key</tt> begin by a <tt>'!'</tt> character: <tt>!key=value</tt> the <tt>key</tt> will be removed from the environment after the substitution.</p>
+<h2> Example of use </h2>
+	<pre>
+	#!/usr/bin/execlineb -P
+	fdmove -c 2 1
+	66-envfile -f ntpd /etc/66/conf/
+	foreground { mkdir -p  -m 0755 ${RUNDIR} } 
+	execl-cmdline -s { ntpd ${CMD_ARGS} }
+	</pre>
+	<tt>/etc/66/conf/ntpd</tt> file contain :
+	<pre>
+	!RUNDIR=/run/openntpd
+	!CMD_ARGS=-d -s
+	</pre>
+	<p>66-envfile reads <tt>/etc/66/conf/ntpd</tt> file, parses the file, import the variable <tt>RUNDIR</tt> and <tt>CMD_ARGS</tt>, replaces the <tt>${RUNDIR}</tt> and <tt>${CMD_ARGS}</tt> by the corresponding values, unexport the variable then execs the ntpd commandline.</p>
+	<p>The strict equivalent with s6-envdir and importas command will be:</p>
+	<pre>
+	#!/usr/bin/execlineb -P
+	fdmove -c 2 1
+	s6-envdir /etc/66/conf
+	importas -u RUNDIR RUNDIR
+	importas -u CMD_ARGS CMD_ARGS
+	foreground { mkdir -p  -m 0755 ${RUNDIR} } 
+	execl-cmdline -s { ntpd ${CMD_ARGS} }
+	</pre>
+	<p>where <tt>/etc/66/conf</tt> directory contains two named files <tt>RUNDIR</tt> and <tt>CMD_ARGS</tt> written with <tt>/run/openntpd</tt> and <tt>-d -s</tt> respectively.</p>
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