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diff --git a/ltt/branches/poly/ltt/convert/README b/ltt/branches/poly/ltt/convert/README
index 7f4de73b..e3af7f7b 100644
--- a/ltt/branches/poly/ltt/convert/README
+++ b/ltt/branches/poly/ltt/convert/README
@@ -1,14 +1,19 @@
 The application 'convert' is used to convert an old format tracefile into a new 
-format tracefile. It has three commandline parameters, the first is tracefile 
-name, the second is a number (number of cpu), the last one is root directory
-for the new trace (this can be omitted, by default it is 'foo')
+format tracefile. It has several commandline parameters, the first is process file 
+name, the second is a number (the number of cpu in the machine), the third is
+the first tracefile name(corresponding to the first cpu), the fourth is the 
+second tracefile name(corresponding to the second cpu), the fifth is ...,   
+the last one is root directory for the new trace (this can be omitted, 
+by default it is 'foo')
 
 The command line looks like this:      
-        convert tracefile_name number_cpu foo_dir
+ ./convert processfile_name the_number_of_cpu first_tracefile_name, ..., foo_dir
 
-There is also an script file 'sysInfo' which is used to get system information
+There is also a script file 'sysInfo' which is used to get system information
 from your local machine, the information is saved in 'sysInfo.out' which will 
-be read by 'convert' later. If the old tracefile is generated in other machine,
+be read by 'convert' later. If the old tracefile is generated by other machine,
 then the 'sysInfo.out' should be gotten from that machine.
 
+'core.xml' is a facility file, after run 'convert', it needs to be copied to
+'foo_dir/eventdefs' directory