diff --git a/README.md b/README.md
index 7422cf00..36f5c260 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,8 @@ Use the `blocks` command to extract blocks from a file:
 
 ![blocks](_docs/blocks.png)
 
+To output only the block content, separated by the null character, use the flags ``--zero-terminated` or `z`.
+
 ### Show What Format Would Do
 
 Use the `diff` command to see what would be formatted (files can also be piped in on stdin) :
diff --git a/cli/cmds.go b/cli/cmds.go
index fb4d8b5f..df9f8254 100644
--- a/cli/cmds.go
+++ b/cli/cmds.go
@@ -200,7 +200,7 @@ func Make() *cobra.Command {
 		},
 	}
 	root.AddCommand(blocksCmd)
-	blocksCmd.Flags().BoolP("zero-terminated", "0", false, "outputs blocks separated by null separator")
+	blocksCmd.Flags().BoolP("zero-terminated", "z", false, "outputs blocks separated by null separator")
 
 	root.AddCommand(&cobra.Command{
 		Use:   "version",