diff --git a/_includes/devdoc/guide_p2p_network.md b/_includes/devdoc/guide_p2p_network.md
index e907aaa7..a1c6bfa1 100644
--- a/_includes/devdoc/guide_p2p_network.md
+++ b/_includes/devdoc/guide_p2p_network.md
@@ -589,6 +589,40 @@ Earlier versions of Bitcoin Core allowed developers and trusted community member
{% endautocrossref %}
+### Masternode Sync
+
+{% include helpers/subhead-links.md %}
+
+{% autocrossref %}
+
+Dash Core performs masternode synchronization as required, but it can be started
+manually by issuing the `mnsync reset` RPC command.
+
+*Masternode Sync Data Flow*
+
+| **Syncing Node Message** | **Direction** | **Masternode Response** | **Description** |
+| **1. Sporks** | | | |
+| `getsporks` message | → | | Syncing node requests sporks
+| | ← | `spork` message(s) |
+| **2. Masternode List** | | | Sync Masternode list from other connected clients |
+| `dseg` message | → | | Syncing node requests masternode list
+| | ← | `ssc` message | Number of entries in masternode list (MASTERNODE_SYNC_LIST)
Only sent if requesting entire list
+| | ← | `inv` message(s) (mnb) | MSG_MASTERNODE_ANNOUNCE
+| | ← | `inv` message(s) (mnp) | MSG_MASTERNODE_PING
+| `getdata` message(s) (mnb) | → | | (Optional)
+| `getdata` message(s) (mnp) | → | | (Optional)
+| | ← | `mnb` message(s) | (If requested) Masternode announce message
+| | ← | `mnp` message(s) | (If requested) Masternode ping message
+| **3. Masternode payments** | | | Ask node for all payment votes it has (new nodes will only return votes for future payments) |
+| `mnget` message | → | | Syncing node requests masternode payment sync
+| | ← | `ssc` message | Number of entries in masternode payment list
+| | ← | `inv` message(s) (mnw) | MSG_MASTERNODE_PAYMENT_VOTE
+| `getdata` message(s) (mnw) | → | | (Optional)
+| | ← | `mnw` message(s) | (If requested) Masternode payment vote message
+| **4. Governance** | | | See [Governance sync](#governance) |
+
+{% endautocrossref %}
+
### Governance
diff --git a/_includes/devdoc/ref_p2p_networking.md b/_includes/devdoc/ref_p2p_networking.md
index 078115c6..089d22fc 100644
--- a/_includes/devdoc/ref_p2p_networking.md
+++ b/_includes/devdoc/ref_p2p_networking.md
@@ -1855,8 +1855,9 @@ entry. To request the list of all masternodes, use an empty txIn (TXID of all
zeros and an index of 0xFFFFFFFF). To request information about a specific
masternode, use the unspent output associated with that masternode.
-The response to a `dseg` message is an `mnb` message and an `mnp` message from
-the masternode(s) requested.
+The response to a `dseg` message is an `mnb` message inventory and an
+`mnp` message inventory for each requested masternode. Masternodes ignore this
+request if they are not fully synced.
| Bytes | Name | Data type | Required | Description |
| ---------- | ----------- | --------- | -------- | -------- |
@@ -1997,11 +1998,18 @@ Masternode Ping Message
{% autocrossref %}
-The `mnget` message requests masternode payment sync.
+The `mnget` message requests masternode payment sync. The response to an
+`mnget` message is an `mnb` message inventory and an `mnp` message inventory for
+each requested masternode. Masternodes ignore this request if they are not fully synced.
| Bytes | Name | Data type | Required | Description |
| ---------- | ----------- | --------- | -------- | -------- |
-| 4 | nMnCount | int | Required |
+| 4 | nMnCount | int | Required | Number of masternode payment votes to request
+
+{% highlight text %}
+Note: Dash Core limits how frequently a masternode payment sync can be
+requested. Frequent requests will result in the node being banned.
+{% endhighlight %}
The following annotated hexdump shows a `mnget` message. (The
message header has been omitted.)
@@ -2156,7 +2164,10 @@ dd6cc6c11211793b239c2e311f1496e2
{% autocrossref %}
-The `ssc` message is used to track the sync status of masternode objects.
+The `ssc` message is used to track the sync status of masternode objects. This
+message is sent in response to sync requests for masternode payments
+(`mnw` message), masternode list (`mnget` message),
+governance objects (`govsync` message), and governance object votes (`govsync` message).
| Bytes | Name | Data type | Required | Description |
| ---------- | ----------- | --------- | -------- | -------- |
@@ -2371,6 +2382,19 @@ dc45e9c09ee0427223e332b52e8d709e
The `govsync` message is used to request syncing of governance objects
(`govobj` message and `govobjvote` message) with peers.
+This message responds in two ways depending on the request:
+
+1. When a masternode receives a `govsync` message with a hash of all zeros, it
+responds with a `govobj` inventory message (MSG_GOVERNANCE_OBJECT - 0x17) for
+all valid governance objects. Governance object votes are excluded in this type
+of response.
+
+2. When a masternode receives a `govsync` message with a specific hash, it
+responds with both a `govobj` inventory message (MSG_GOVERNANCE_OBJECT - 0x17)
+and a `govobjvote` inventory message (MSG_GOVERNANCE_OBJECT_VOTE - 0x18) for
+the single goverance object requested.
+
+
| Bytes | Name | Data type | Required | Description |
| ---------- | ----------- | --------- | -------- | -------- |
| 32 | nHash | uint256 | Required |
diff --git a/_includes/references.md b/_includes/references.md
index 06b7e71b..6b53f160 100644
--- a/_includes/references.md
+++ b/_includes/references.md
@@ -242,8 +242,8 @@ http://opensource.org/licenses/MIT.
[getheaders message]: /en/developer-reference#getheaders "A P2P protocol message used to request a range of block headers"
[getsporks message]: /en/developer-reference#getsporks "A P2P network message used to request the status of sporks"
[govobj message]: /en/developer-reference#govobj "A P2P network message used to send governance objects"
-[govobjvote message]: /en/developer-reference#govobj "A P2P network message used to send governance object votes"
-[govsync message]: /en/developer-reference#govobj "A P2P network message used to synchronize governance objects"
+[govobjvote message]: /en/developer-reference#govobjvote "A P2P network message used to send governance object votes"
+[govsync message]: /en/developer-reference#govsync "A P2P network message used to synchronize governance objects"
[headers message]: /en/developer-reference#headers "A P2P protocol message containing one or more block headers"
[inv message]: /en/developer-reference#inv "A P2P protocol message used to send inventories of transactions and blocks known to the transmitting peer"
[ix message]: /en/developer-reference#ix "A P2P protocol message which sends a single serialized transaction via InstantSend"