diff --git a/README.md b/README.md
index 2d630cd..420e01b 100644
--- a/README.md
+++ b/README.md
@@ -209,6 +209,10 @@ pager: true
 width: 80
 # show all files, including hidden and ignored.
 all: false
+# show line numbers (TUI-mode only)
+showLineNumbers: false
+# preserve newlines in the output
+preserveNewLines: false
 ```
 
 ## Feedback
diff --git a/main.go b/main.go
index 68d7f1c..b0d7a77 100644
--- a/main.go
+++ b/main.go
@@ -170,6 +170,7 @@ func validateOptions(cmd *cobra.Command) error {
 	tui = viper.GetBool("tui")
 	showAllFiles = viper.GetBool("all")
 	preserveNewLines = viper.GetBool("preserveNewLines")
+	showLineNumbers = viper.GetBool("showLineNumbers")
 
 	if pager && tui {
 		return errors.New("cannot use both pager and tui")