usage to readme

Author: tikinang

main.go

@@ -42,10 +42,10 @@ func main() {
 
 	flag.StringVar(&target, "target", wd, "Path to write changed files to.")
 	flag.BoolVar(&force, "force", false, "Execute all changes without asking.")
-	flag.BoolVar(&debug, "debug", false, "Print extra information.")
-	flag.BoolVar(&clean, "clean", false, "Clean-up target dir.")
+	flag.BoolVar(&debug, "debug", false, "Print debug information.")
+	flag.BoolVar(&clean, "clean", false, "Remove all files and dirs from target, but only if target differs from working dir.")
 	flag.BoolVar(&quartz, "quartz", false, "Prepare frontmatter for Quartz publishing.")
-	flag.BoolVar(&reformat, "reformat", false, "Replace frontmatter with this tool format and fix ending newline.")
+	flag.BoolVar(&reformat, "reformat", false, "Replace frontmatter with this tool format and fix ending newlines.")
 	flag.BoolVar(&fixChtimeFromGit, "git-chtime", false, "Change files chtime from git, useful right after git clone.")
 	flag.Parse()
 

readme.md

@@ -4,3 +4,22 @@
 Basically adding `title` and `lastmod` frontmatter attributes, and little formatting.
 There are further feature possibilities, such as preprocessing of embedded linked content, that are hard to implement solely in hugo templates, as done in Quartz :/
 **Written in Go!**
+
+## Usage
+```
+Usage of obsifix:
+  -clean
+        Remove all files and dirs from target, but only if target differs from working dir.
+  -debug
+        Print debug information.
+  -force
+        Execute all changes without asking.
+  -git-chtime
+        Change files chtime from git, useful right after git clone.
+  -quartz
+        Prepare frontmatter for Quartz publishing.
+  -reformat
+        Replace frontmatter with this tool format and fix ending newlines.
+  -target string
+        Path to write changed files to. (default "/home/tikinang/code/go/obsifix")
+```