diff --git a/README.txt b/README.txt
--- a/README.txt
+++ b/README.txt
Options are:
-h help
- -g Generates a well documented default parameter file
-
-Once you have the default parameter file, you can edit it as per your needs
-and run the program without any arguments to generate the stellar spectrum.
-NOTE: This program requires the kurucz model datafiles to simulate stellar
-spectrum. If you have installed it right, these files would be installed in
+ -g Generates a well documented default parameter file
+ Once you have the default parameter file, you can edit it as per your
+ needs and run the program without any arguments to generate the stellar
+ spectrum.
+
+ -p <parameter_file>
+ Default parameter file is "stellarspec_initparams.txt". You can
+ override this using -p flag. For eg., if several instances of this
+ program are running in parallel from same directory, this flag can
+ be used to avoid conflicts around same parameter file name.
+
+NOTE: This program requires the kurucz model datafiles to simulate stellar
+spectrum. If you have installed it right, these files would be installed in
<prefix>/share/cads/data/ and the default parameter file is aware of the
location. These datafiles are also available in the subdirectory named
-"spectral_data" inside the source distribution as well.
+"spectral_data" inside the source distribution as well.
3. DOCUMENTATION