can't change url-pattern

1.Create Seam Project : File -> New -> Seam Web Project
a. 1 step : input Project Name, select target runtime, target server.
b. 2 step : leave default values
c. 3 step : leave default values
d. 4 step :remove ".seam" url-mapping-pattern and add ".faces" url-mapping-pattern
e. 5 step : leave default values
2. open web.xml and observe that url-patterns is "*.seam" all the same