diff --git a/docs/reference/radio/on-data-received.md b/docs/reference/radio/on-data-received.md
index b0095175..6df4d593 100644
--- a/docs/reference/radio/on-data-received.md
+++ b/docs/reference/radio/on-data-received.md
@@ -1,13 +1,19 @@
 # On Data Received
 
-Registers code to run when a packet is received over ``radio``.
+Run part of a program when the micro:bit receives a
+[number](/reference/types/number) or [string](/reference/types/string) over ``radio``.
 
 ### Parameters
 
-* body - is an action
+* **body** is the part of the program to run when the micro:bit receives information over ``radio``.
 
 ### Example
 
+This program never stops.  It keeps sending numbers that says how
+fast the micro:bit is slowing down or speeding up.  It also receives
+numbers that say how fast nearby micro:bits are going. It
+shows these numbers as a [bar graph](/reference/led/plot-bar-graph).
+
 ```blocks
 basic.forever(() => {
     radio.sendNumber(input.acceleration(Dimension.X));
@@ -19,5 +25,6 @@ radio.onDataReceived(() => {
 
 ### See also
 
-[receive number](/reference/radio/receive-number), [send number](/reference/radio/send-number), [set group](/reference/radio/set-group)
+[receive number](/reference/radio/receive-number),
+[send number](/reference/radio/send-number), [set group](/reference/radio/set-group)
 
diff --git a/package.json b/package.json
index 282c17a9..ab408717 100644
--- a/package.json
+++ b/package.json
@@ -29,6 +29,6 @@
     "typescript": "^1.8.7"
   },
   "dependencies": {
-    "pxt-core": "0.2.155"
+    "pxt-core": "0.2.154"
   }
 }