diff --git a/docs/contracts/interfaces/IBasicGuildRewardNFT.md b/docs/contracts/interfaces/IBasicGuildRewardNFT.md
index 97e1835..c366281 100644
--- a/docs/contracts/interfaces/IBasicGuildRewardNFT.md
+++ b/docs/contracts/interfaces/IBasicGuildRewardNFT.md
@@ -220,17 +220,3 @@ error IncorrectSignature()
 
 Error thrown when the supplied signature is invalid.
 
-### NonExistentToken
-
-```solidity
-error NonExistentToken(uint256 tokenId)
-```
-
-Error thrown when trying to query info about a token that's not (yet) minted.
-
-#### Parameters
-
-| Name | Type | Description |
-| ---- | ---- | ----------- |
-| tokenId | uint256 | The queried id. |
-
diff --git a/docs/contracts/interfaces/IERC5192.md b/docs/contracts/interfaces/IERC5192.md
new file mode 100644
index 0000000..97fb0c1
--- /dev/null
+++ b/docs/contracts/interfaces/IERC5192.md
@@ -0,0 +1,60 @@
+# IERC5192
+
+## Functions
+
+### locked
+
+```solidity
+function locked(
+    uint256 tokenId
+) external returns (bool)
+```
+
+Returns the locking status of an Soulbound Token
+
+SBTs assigned to zero address are considered invalid, and queries
+about them do throw.
+
+#### Parameters
+
+| Name | Type | Description |
+| :--- | :--- | :---------- |
+| `tokenId` | uint256 | The identifier for an SBT. |
+
+## Events
+
+### Locked
+
+```solidity
+event Locked(
+    uint256 tokenId
+)
+```
+
+Emitted when the locking status is changed to locked.
+
+If a token is minted and the status is locked, this event should be emitted.
+
+#### Parameters
+
+| Name | Type | Description |
+| :--- | :--- | :---------- |
+| `tokenId` | uint256 | The identifier for a token. |
+### Unlocked
+
+```solidity
+event Unlocked(
+    uint256 tokenId
+)
+```
+
+Emitted when the locking status is changed to unlocked.
+
+If a token is minted and the status is unlocked, this event should be emitted.
+
+#### Parameters
+
+| Name | Type | Description |
+| :--- | :--- | :---------- |
+| `tokenId` | uint256 | The identifier for a token. |
+
diff --git a/docs/contracts/token/SoulboundERC721.md b/docs/contracts/token/SoulboundERC721.md
index e2a0b7a..7ab6946 100644
--- a/docs/contracts/token/SoulboundERC721.md
+++ b/docs/contracts/token/SoulboundERC721.md
@@ -41,6 +41,25 @@ See {IERC165-supportsInterface}.
 | :--- | :--- | :---------- |
 | `interfaceId` | bytes4 |  |
 
+### locked
+
+```solidity
+function locked(
+    uint256 tokenId
+) external returns (bool)
+```
+
+Returns the locking status of an Soulbound Token
+
+SBTs assigned to zero address are considered invalid, and queries
+about them do throw.
+
+#### Parameters
+
+| Name | Type | Description |
+| :--- | :--- | :---------- |
+| `tokenId` | uint256 | The identifier for an SBT. |
+
 ### approve
 
 ```solidity
@@ -169,6 +188,20 @@ Still used for minting/burning.
 
 ## Custom errors
 
+### NonExistentToken
+
+```solidity
+error NonExistentToken(uint256 tokenId)
+```
+
+Error thrown when trying to query info about a token that's not (yet) minted.
+
+#### Parameters
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| tokenId | uint256 | The queried id. |
+
 ### Soulbound
 
 ```solidity