Document the default recipe (#1006)

README.adoc

@@ -404,6 +404,37 @@ This https://toniogela.dev/just/[blog post] discusses using `just` to improve ma
 
 == Features
 
+=== The Default Recipe
+
+When `just` is invoked without a recipe, it runs the first recipe in the justfile. This recipe might be the most frequently run command in the project, like running the tests:
+
+```make
+test:
+  cargo test
+```
+
+You can also use dependencies to run multiple recipes by default:
+
+```make
+default: lint build test
+
+build:
+  echo Building…
+
+test:
+  echo Testing…
+
+lint:
+  echo Linting…
+```
+
+If no recipe makes sense as the default recipe, you can add a recipe to the beginning of your justfile that lists the available recipes:
+
+```
+default:
+  just --list
+```
+
 === Listing Available Recipes
 
 Recipes can be listed in alphabetical order with `just --list`: