diff --git a/2021/readme.md b/2021/readme.md
index 87350b5..600d513 100644
--- a/2021/readme.md
+++ b/2021/readme.md
@@ -12,6 +12,12 @@ Specifically, here's my `deno --version` output:
 
 Enjoy!
 
+## Usage
+
+Run these solutions like so:
+
+    deno run --unstable --allow-all $DAY.ts
+
 # Days
 
 - [x] [Day 1](./1.ts)