docs: add help text for --update-only

Programmeris · Oct 14, 2020 · 88e4c56 · 88e4c56
1 parent 04ffd96
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diff --git a/README.md b/README.md
@@ -140,6 +140,10 @@ You can print to stdout by using the `-s` or `--stdout` option.
 
 [ack]: http://beyondgrep.com/
 
+### Only update existing ToC
+
+Use `--update-only` or `-u` to only update the existing ToC. That is, the Markdown files without ToC will be left untouched. It is good if you want to use `doctoc` with `lint-staged`.
+
 ### Usage as a `git` hook
 
 doctoc can be used as a [pre-commit](http://pre-commit.com) hook by using the

diff --git a/doctoc.js b/doctoc.js
@@ -62,7 +62,7 @@ function printUsageAndExit(isErr) {
 
   var outputFunc = isErr ? console.error : console.info;
 
-  outputFunc('Usage: doctoc [mode] [--entryprefix prefix] [--notitle | --title title] [--maxlevel level] [--all] <path> (where path is some path to a directory (e.g., .) or a file (e.g., README.md))');
+  outputFunc('Usage: doctoc [mode] [--entryprefix prefix] [--notitle | --title title] [--maxlevel level] [--all] [--update-only] <path> (where path is some path to a directory (e.g., .) or a file (e.g., README.md))');
   outputFunc('\nAvailable modes are:');
   for (var key in modes) {
     outputFunc('  --%s\t%s', key, modes[key]);