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diff --git a/tcllib/modules/pt/include/export/config/param.inc b/tcllib/modules/pt/include/export/config/param.inc
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+[section Configuration]
+
+The PARAM export plugin recognizes the following configuration
+variables and changes its behaviour as they specify.
+
+[list_begin arguments]
+
+[arg_def string template]
+
+If this configuration variable is set it is assumed to contain a
+string into which to put the generated text and other configuration
+data. The various locations are expected to be specified with the
+following placeholders:
+
+[list_begin definitions]
+
+[def [const @user@]]
+To be replaced with the value of the configuration variable [option user].
+
+[def [const @format@]]
+To be replaced with the the constant [const PARAM].
+
+[def [const @file@]]
+To be replaced with the value of the configuration variable [option file].
+
+[def [const @name@]]
+To be replaced with the value of the configuration variable [option name].
+
+[def [const @code@]]
+To be replaced with the generated text.
+
+[list_end]
+
+[para]
+
+If this configuration variable is not set, or empty, then the plugin
+falls back to a standard template, which is defined as "[const @code@]".
+
+[list_end]
+
+[emph Note] that this plugin may ignore the standard configuration
+variables [var user], [var format], [var file], and their values,
+depending on the chosen template.
+
+[para]
+
+The content of the standard configuration variable [var name], if set,
+is used as name of the grammar in the output. Otherwise the plugin
+falls back to the default name [const a_pe_grammar].