Update README.md

Author: abhisheksarkar30

README.md

@@ -10,10 +10,11 @@ This is a simple java tool to check diff between two excel files.
 Java 8+
 
 ## Usage
-java -jar excel-diff-checker.jar \<File1-path> \<File2-path> [r] -> where File1 and File2 are mandatory, option: 'r' is optional.
+java -jar excel-diff-checker.jar \<File1-path> \<File2-path> [-r] [-s \<Comma-separated sheet-names>]-> where File1 and File2 are mandatory, options: 'r' & 's' are optional.
 
 ## Notes to follow
  - This tool is not having any complex algorithm to check diff, so won't be able to detect column/row addition/deletion.
  - It basically considers File1 as base, and checks for diff cell-by-cell in File2, even for sheets too.
  - By default, it adds cell comments/note saying like 'Expected: value1, Found: value2' in a copy of File1 excel and produces it as a different result file.
- - Instead of above, if only remarks required about different cell diffs i.e. no separate reult file required, in that case, the option: 'r' can be used, which just prints the diff note as mentioned in above point, in the console output and not as cell comment of a new file.
+ - Instead of above, if only remarks required about different cell diffs i.e. no separate result file required, in that case, the option: 'r' can be used, which just prints the diff note as mentioned in above point, in the console output and not as cell comment of a new file.
+ - By using option 's', we can compare specific sheets only.