diff --git a/pym/cl_template.py b/pym/cl_template.py
index 14ca137..a09e75e 100644
--- a/pym/cl_template.py
+++ b/pym/cl_template.py
@@ -2971,7 +2971,7 @@ or 'lower' or 'capitalize'"))
             if not terms[2] in ['url','purl','unicode']:
                 self.printErrTemplate()
                 cl_overriding.printERROR(_("third argument function is not "
-                                            "'url' or 'unicode'"))
+                                            "'url' or 'purl' or 'unicode'"))
                 cl_overriding.exit(1)
             if terms[1]:
                 self.printErrTemplate()