From 89d28751d2bb36413d4c6d804c300ee634d7d771 Mon Sep 17 00:00:00 2001
From: Paolo Lazzari <lazzari.paolok@gmail.com>
Date: Wed, 11 Oct 2023 17:54:58 +0200
Subject: [PATCH] Update README.md

---
 README.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/README.md b/README.md
index d7d3c17..14fd06b 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,14 @@ $ go build -o /usr/local/bin/
 
 N.B. The program must be installed on your machine.
 
+The input is evaluated immediately as you type without any validation.
+If you want to use `play` in read-only mode, thus avoding any file changes (such as those that would result if, for instance, `sed -i` was used), then you can use a docker container:
+
+```bash
+$ docker run --rm -it -v "$(pwd)":/play:ro plazzari/play:latest grep
+```
+
+
 ## Key bindings
 
 | Component       | Key           | Description |