diff --git a/openapi/index.json b/openapi/index.json
index 0d12decbf5..069b3c4545 100644
--- a/openapi/index.json
+++ b/openapi/index.json
@@ -53,6 +53,14 @@
       "patch": {
         "$ref": "operations/issues/update.json"
       }
+    },
+    "/repos/{owner}/{repo}/issues/{number}/lock": {
+      "put": {
+        "$ref": "operations/issues/lock.json"
+      },
+      "delete": {
+        "$ref": "operations/issues/unlock.json"
+      }
     }
   }
 }
diff --git a/openapi/operations/issues/lock.json b/openapi/operations/issues/lock.json
new file mode 100644
index 0000000000..3f5616f2e8
--- /dev/null
+++ b/openapi/operations/issues/lock.json
@@ -0,0 +1,58 @@
+{
+  "summary": "Lock an issue",
+  "description": "Users with push access can lock an issue or pull request's conversation.\n\nNote that, if you choose not to pass any parameters, you'll need to set `Content-Length` to zero when calling out to this endpoint. For more information, see \"[HTTP verbs](https://developer.github.com/v3/#http-verbs).\"",
+  "operationId": "lock",
+  "tags": [
+    "issues"
+  ],
+  "externalDocs": {
+    "description": "API method documentation",
+    "url": "https://developer.github.com/v3/issues/#lock-an-issue"
+  },
+  "parameters": [{
+      "$ref": "../../parameters.json#/owner"
+    },
+    {
+      "$ref": "../../parameters.json#/repo"
+    },
+    {
+      "$ref": "../../parameters.json#/number"
+    }
+  ],
+  "requestBody": {
+    "content": {
+      "application/json": {
+        "schema": {
+          "type": "object",
+          "properties": {
+            "lock_reason": {
+              "type": "string",
+              "enum": [
+                "off-topic",
+                "too heated",
+                "resolved",
+                "spam"
+              ],
+              "description": "The reason for locking the issue or pull request conversation. Lock will fail if you don't use one of these reasons:  \n\\* `off-topic`  \n\\* `too heated`  \n\\* `resolved`  \n\\* `spam`"
+            }
+          }
+        }
+      }
+    }
+  },
+  "x-code-samples": [
+    {
+      "lang": "Shell",
+      "source": "curl -X PUT https://api.github.com/repos/octocat/hello-world/issues/1/lock"
+    },
+    {
+      "lang": "JS",
+      "source": "client.issues.lock({\n  owner: 'octocat',\n  repo: 'hello-world',\n  number: 1\n})"
+    }
+  ],
+  "responses": {
+    "204": {
+      "description": "No Content"
+    }
+  }
+}
diff --git a/openapi/operations/issues/unlock.json b/openapi/operations/issues/unlock.json
new file mode 100644
index 0000000000..b852f987a9
--- /dev/null
+++ b/openapi/operations/issues/unlock.json
@@ -0,0 +1,37 @@
+{
+  "summary": "Unlock an issue",
+  "description": "Users with push access can unlock an issue's conversation.",
+  "operationId": "lock",
+  "tags": [
+    "issues"
+  ],
+  "externalDocs": {
+    "description": "API method documentation",
+    "url": "https://developer.github.com/v3/issues/#unlock-an-issue"
+  },
+  "parameters": [{
+      "$ref": "../../parameters.json#/owner"
+    },
+    {
+      "$ref": "../../parameters.json#/repo"
+    },
+    {
+      "$ref": "../../parameters.json#/number"
+    }
+  ],
+  "x-code-samples": [
+    {
+      "lang": "Shell",
+      "source": "curl -X DELETE https://api.github.com/repos/octocat/hello-world/issues/1/lock"
+    },
+    {
+      "lang": "JS",
+      "source": "client.issues.unlock({\n  owner: 'octocat',\n  repo: 'hello-world',\n  number: 1\n})"
+    }
+  ],
+  "responses": {
+    "204": {
+      "description": "No Content"
+    }
+  }
+}