<varlistentry>
<term><literal>:=</literal></term>
<listitem>
- <para>Assign a value to a key finally; disallow any later changes.</para>
+ <para>Assign a value to a key finally; disallow any later changes.</para>
</listitem>
</varlistentry>
</variablelist>
<varlistentry>
<term><option>string_escape=<replaceable>none|replace</replaceable></option></term>
<listitem>
- <para>Usually, control and other possibly unsafe characters are replaced
- in strings used for device naming. The mode of replacement can be specified
- with this option.</para>
+ <para>When <literal>replace</literal>, possibly unsafe characters in strings
+ assigned to <varname>NAME</varname>, <varname>SYMLINK</varname>, and
+ <varname>ENV{<replaceable>key</replaceable>}</varname> are replaced. When
+ <literal>none</literal>, no replacement is performed. When unset, the replacement
+ is performed for <varname>NAME</varname>, <varname>SYMLINK</varname>, but not for
+ <varname>ENV{<replaceable>key</replaceable>}</varname>. Defaults to unset.</para>
</listitem>
</varlistentry>
<varlistentry>