restriction is required for security reasons.</li>
<li>When using the rewrite engine in <code>.htaccess</code> files the
-per-directory prefix (which always is the same for a specific
-directory) is automatically <em>removed</em> for the RewriteRule pattern matching
+per-directory prefix (that is, the URI path that lead to the directory
+containing this <code>.htaccess</code> file)
+is automatically <em>removed</em> for the RewriteRule pattern matching
and automatically <em>added</em> after any relative (not starting with a
slash or protocol name) substitution encounters the end of a rule set.
See the <directive module="mod_rewrite">RewriteBase</directive>