diff --git a/README.md b/README.md
index 6d92af7..02c7981 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,56 @@ brew tap raphamorim/jam https://github.com/raphamorim/jam
 brew install --HEAD jam
 ```
 
+Quick overview:
+
+```jam
+const std = import("std");
+const {Vec} = import("collections");
+
+const Histogram = struct {
+    bins: Vec(u32),
+
+    // `cfn` opts a method into the compiler's synthesized-call set.
+    //
+    //   cfn default()       opt-in constructor
+    //   cfn drop(...)       auto-fires at every scope exit
+    //   cfn at(self, i)     desugars `obj[i]`     (read)
+    //   cfn setAt(...)      desugars `obj[i] = x` (write)
+    cfn default() Self {
+        var bins: Vec(u32) = Vec(u32).withCapacity(256);
+        var i: u32 = 0;
+        while (i < 256) {
+            bins.push(0);
+            i = i + 1;
+        }
+        return Self { bins: bins };
+    }
+    cfn drop(self: mut Self) {
+        std.fmt.println("drop has happened");
+    }
+    cfn at(self: Self, i: u32) u32 {
+        return self.bins[i];
+    }
+    cfn setAt(self: mut Self, i: u32, value: u32) {
+        self.bins[i] = value;
+    }
+
+    fn record(self: mut Self, byte: u8) {
+        const i: u32 = byte as u32;
+        self[i] = self[i] + 1;
+    }
+};
+
+fn main() {
+    var h: Histogram = Histogram.default();
+    h.record(7);
+    h.record(7);
+    h.record(42);
+    std.fmt.println(h[7]);    // 2, via h.at(7)
+    std.fmt.println(h[42]);   // 1
+}
+```
+
 ## Contributing
 
 1. [Donate monthly](https://github.com/sponsors/raphamorim).