diff --git a/Extending Cargo.md b/Extending Cargo.md
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@@ -1 +1,8 @@
-# Extending Cargo with Custom Commnads
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+# Extending Cargo with Custom Commnads
+The design of Cargo is such that you can extend it with new subcommands without having to modify Cargo.
+
+If a binary in your `$PATH` is named `cargo-somethig`, you can run it as if it was a Cargo subcommand by running `cargo something`.
+
+Custom commands like this are also listed when you run `cargo --list`
+
+Using `cargo install` to install extensions and then run them just like built-in Cargo tools is a very convenient benefit of Cargo's design.
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