diff --git a/src/processor/comparison/comparisonantlr/Readme.txt b/src/processor/comparison/comparisonantlr/Readme.txt
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+++ b/src/processor/comparison/comparisonantlr/Readme.txt
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+Update the parser, lexer and token files for changes in comparator.g4 file. 
+cd <clonedir>/src/processor/comparison/comparisonantlr
+Install antlr tools
+pip install antlr4-tools
+Generate the files
+antlr4 -Dlanguage=Python3 comparator.g4
+Commit and push the files to thee branch.
+git add comparatorLexer.py comparatorListener.py comparatorParser.py
+git commit -m "Updated parser and lexer generated files for 4.13.0 version"
+git push origin <branchname>
+
+