diff --git a/IMPLEMENTATION.md b/IMPLEMENTATION.md
index 7713aeb..9b888ed 100644
--- a/IMPLEMENTATION.md
+++ b/IMPLEMENTATION.md
@@ -41,15 +41,18 @@ Cast SDK API calls are translated into Chromecast protocol messages and sent via
 
 # Messages (WIP)
 
-| Subject | Origin | Destination | Description |
-| --- | --- | --- | --- |
-| `shim:/initialized` | background | shim | Sent after bridge has been created. |
-| `bridge:/discover` | shim | bridge | Starts network discovery. |
-| `shim:/serviceUp` | bridge | shim | Sent when a receiver device has been found. |
-| `shim:/serviceDown` | bridge | shim | Sent when a receiver device has been lost. |
-| `main:/openPopup` | shim | background | Opens the receiver selection popup. |
-| `popup:/assignShim` | background | popup | Provides popup with tab/frame ID for the opener shim so that it can make a direct connection. |
-| `shim:/popupReady` | popup | shim | Sent after popup is ready to be populated. |
-| `popup:/populateReceiverList` | shim | popup | Supplies popup with current `state.receiverList`. |
-| `shim:/selectReceiver` | popup | shim | Sent once a receiver has been selected. |
+<img src="diagram.svg" width="550">
+
+| No. | Subject | Origin | Destination | Description |
+| --- | --- | --- | --- | --- |
+| 1 | `shim:/initialized` | background | shim | Sent after bridge has been created. |
+| 2 | `bridge:/discover` | shim | bridge | Starts network discovery. |
+| 3 | `shim:/serviceUp` | bridge | shim | Sent when a receiver device has been found. |
+| 4 | `shim:/serviceDown` | bridge | shim | Sent when a receiver device has been lost. |
+| 5 | `main:/openPopup` | shim | background | Opens the receiver selection popup. |
+| 6 | `popup:/assignShim` | background | popup | Provides popup with tab/frame ID for the opener shim so that it can make a direct connection. |
+| 7 | `shim:/popupReady` | popup | shim | Sent after popup is ready to receive data. |
+| 8 | `popup:/populateReceiverList` | shim | popup | Supplies popup with current `state.receiverList`. |
+| 9 | `shim:/selectReceiver` | popup | shim | Sent once a receiver has been selected. |
+| 9 | `popup:/close` | popup | shim | Sent once a receiver has been selected. |
 
diff --git a/diagram.svg b/diagram.svg
new file mode 100644
index 0000000..da8371d
--- /dev/null
+++ b/diagram.svg
@@ -0,0 +1 @@
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y="25.336">3) shim:/serviceUp</tspan> <tspan fill="#000" font-family="SF Mono" font-size="12" font-weight="400" x="0" y="39.336">4) shim:/serviceDown</tspan></text><path d="m259 290h160v40h-160z" fill="#fff"/><text fill="#666" transform="translate(264 295)"><tspan fill="#666" font-family="Helvetica Neue" font-size="12" font-weight="400" x="0" y="11">BRIDGE</tspan> <tspan fill="#283450" font-family="SF Mono" font-size="12" font-weight="400" x="0" y="25.336">2) bridge:/</tspan> <tspan fill="#000" font-family="SF Mono" font-size="12" font-weight="400" y="25.336">discover</tspan></text><path d="m539 670h240v50h-240z" fill="#fff"/><text fill="#666" transform="translate(544 675)"><tspan fill="#666" font-family="Helvetica Neue" font-size="12" font-weight="400" x="0" y="11">INCOMING</tspan> <tspan fill="#000" font-family="SF Mono" font-size="12" font-weight="400" x="0" y="25.336">8) popup:/populateReceiverList</tspan> <tspan fill="#000" font-family="SF Mono" font-size="12" font-weight="400" x="0" y="39.336">10) popup:/close</tspan></text><path d="m539 610h190v50h-190z" fill="#fff"/><text fill="#666" transform="translate(544 615)"><tspan fill="#666" font-family="Helvetica Neue" font-size="12" font-weight="400" x="0" y="11">OUTGOING</tspan> <tspan fill="#283450" font-family="SF Mono" font-size="12" font-weight="400" x="0" y="25.336">9) shim:/</tspan> <tspan fill="#000" font-family="SF Mono" font-size="12" font-weight="400" y="25.336">selectReceiver</tspan> <tspan fill="#000" font-family="SF Mono" font-size="12" font-weight="400" x="0" y="39.336">7) shim:/popupReady</tspan></text><path d="m449 350h170v40h-170z" fill="#fff"/><text fill="#666" transform="translate(454 355)"><tspan fill="#666" font-family="Helvetica Neue" font-size="12" font-weight="400" x="0" y="11">INCOMING</tspan> <tspan fill="#000" font-family="SF Mono" font-size="12" font-weight="400" x="0" y="25.336">1) shim:/initialized</tspan></text><path d="m449 300h150v40h-150z" fill="#fff"/><text fill="#666" transform="translate(454 305)"><tspan fill="#666" font-family="Helvetica Neue" font-size="12" font-weight="400" x="0" y="11">OUTGOING</tspan> <tspan fill="#283450" y="11"/> <tspan fill="#283450" font-family="SF Mono" font-size="12" font-weight="400" x="0" y="25.336">5) main:/openPopup</tspan></text><path d="m629 300h170v40h-170z" fill="#fff"/><text fill="#666" transform="translate(634 305)"><tspan fill="#666" font-family="Helvetica Neue" font-size="12" font-weight="400" x="0" y="11">INCOMING</tspan> <tspan fill="#000" font-family="SF Mono" font-size="12" font-weight="400" x="0" y="25.336">6) popup:/assignShim</tspan></text></g></svg>
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