Add --fail-on-change to README.md

README.md

@@ -157,12 +157,13 @@ https://github.com/WGUNDERWOOD/tex-fmt?tab=readme-ov-file#options)
 section below.
 
 ``` shell
-tex-fmt file.tex             # format file.tex and overwrite
-tex-fmt --check file.tex     # check if file.tex is correctly formatted
-tex-fmt --print file.tex     # format file.tex and print to stdout
-tex-fmt --nowrap file.tex    # do not wrap long lines
-tex-fmt --stdin              # read from stdin and print to stdout
-tex-fmt --help               # view help information
+tex-fmt file.tex                  # format file.tex and overwrite
+tex-fmt --check file.tex          # check if file.tex is correctly formatted
+tex-fmt --print file.tex          # format file.tex and print to stdout
+tex-fmt --fail-on-change file.tex # format file.tex and return exit-code 1 if overwritten 
+tex-fmt --nowrap file.tex         # do not wrap long lines
+tex-fmt --stdin                   # read from stdin and print to stdout
+tex-fmt --help                    # view help information
 ```
 
 ### Configuration