diff --git a/eg/onboard-led.js b/eg/onboard-led.js
new file mode 100644
index 0000000..ca4f78c
--- /dev/null
+++ b/eg/onboard-led.js
@@ -0,0 +1,19 @@
+// global.IS_TEST_ENV = true;
+var Tessel = require("../lib/tessel.js");
+var board = new Tessel();
+
+board.on("ready", function() {
+  console.log("Ready");
+
+  var leds = ["L0", "L1", "L2", "L3"];
+
+  leds.forEach(function(pin) {
+      this.digitalWrite(pin, this.HIGH);
+  }.bind(this));
+  
+  setTimeout(function() {
+    leds.forEach(function(pin) {
+        this.digitalWrite(pin, this.LOW);
+    }.bind(this));
+  }.bind(this), 1000);
+});
diff --git a/readme.md b/readme.md
index a13dcfc..4ab8014 100644
--- a/readme.md
+++ b/readme.md
@@ -33,6 +33,7 @@ board.on("ready", function() {
 ```
 
 ## Pin Naming Guide
+There are two primary ports on the Tessel2: Port "A" and Port "B".  There is also a bank of onboard LEDs which are controllable from a port we are calling "L".  Note that "L0" and "L1" should be reserved for system functions (ERR and WLAN) so you should avoid using them.  Instead, consider using "L2" and "L3" which are intended to be more informational in nature.
 
 | Port | Number | Johnny-Five Compatible Name |
 |------|--------|-----------------------------|
@@ -52,6 +53,10 @@ board.on("ready", function() {
 |B|5|`"b5"` or `"B5"`|
 |B|6|`"b6"` or `"B6"`|
 |B|7|`"b7"` or `"B7"`|
+|L|0|`"l0"` or `"L0"`|
+|L|1|`"l1"` or `"L1"`|
+|L|2|`"l2"` or `"L2"`|
+|L|3|`"l3"` or `"L3"`|
 
 See [examples](https://github.com/rwaldron/tessel-io/tree/master/eg) for basic, non-Johnny-Five examples.
 
@@ -80,6 +85,10 @@ See [examples](https://github.com/rwaldron/tessel-io/tree/master/eg) for basic,
 |B     | 5   | ✓           |     |     |     |      |      | ✓  |    | ✓         |            |
 |B     | 6   | ✓           |     |     |     |      |      |    | ✓  | ✓         |            |
 |B     | 7   | ✓           |     |     |     |      |      |    |    | ✓         | ✓          |
+|L     | 0   | ✓ (out only)|     |     |     |      |      |    |    |           |            |
+|L     | 1   | ✓ (out only)|     |     |     |      |      |    |    |           |            |
+|L     | 2   | ✓ (out only)|     |     |     |      |      |    |    |           |            |
+|L     | 3   | ✓ (out only)|     |     |     |      |      |    |    |           |            |