diff --git a/README.md b/README.md
index 2757f259..1ab25ed9 100644
--- a/README.md
+++ b/README.md
@@ -41,7 +41,9 @@ Cromshell is a CLI for submitting workflows to a Cromwell server and monitoring/
   * `--referer_header_url [TEXT]`
     * For servers that require a referer, supply
     this URL in the `Referer:` header.
-
+  * One of `--machine_processable` or `--colorful_output`
+    * Override the automatically determined output coloring setting.
+    * Otherwise the output will be colored if it detects that it's connected to an interactive terminal.
 ## Supported Subcommands: