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diff --git a/doc/execlineb.html b/doc/execlineb.html
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@@ -19,7 +19,9 @@
 <h1> The <tt>execlineb</tt> program </h1>
 
 <p>
-<tt>execlineb</tt> reads and executes a script.
+<tt>execlineb</tt> reads and executes a script. <br />
+It is a command launcher: it reads a file, turns that file into a command line,
+then executes into that command line.
 </p>
 
 <h2> Interface </h2>