minor edit in README.md
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@@ 38,7 38,7 @@ Usage:
 
 Normally, `xgrep.py` outputs the matching parts of the XML files together with
 their filenames and the XPath expression. If `-r <ns>` is set, the
-[EXSLT function `<ns>:test`](http://exslt.org/regexp/functions/test/) can be
+[EXSLT function `<ns>:test()`](http://exslt.org/regexp/functions/test/) can be
 used in the XPath expression for matching regular expressions. The option `-m`
 outputs only the matching parts, without filenames or XPath expressions. The
 option `-i` indents the matching parts, and the option `-n` includes namespace