diff --git a/public/openapi/bindapi.json b/public/openapi/bindapi.json
index da68609..74ebbc4 100644
--- a/public/openapi/bindapi.json
+++ b/public/openapi/bindapi.json
@@ -2,10 +2,10 @@
 	"openapi": "3.0.2",
 	"info": {
 		"title": "bindAPI",
-		"version": "0.0.1",
+		"version": "0.0.2",
 		"description": "TODO …",
 		"contact": {
-			"name": "micha Espey",
+			"name": "Micha Espey",
 			"email": "tracer@24unix.net"
 		}
 	},
@@ -31,6 +31,9 @@
 		{
 			"name": "Server"
 		},
+		{
+			"name": "DNS"
+		},
 		{
 			"name": "Domains"
 		}
@@ -66,6 +69,45 @@
 				]
 			}
 		},
+		"/dyndns/{hostname}": {
+			"get": {
+				"tags": [
+					"DNS"
+				],
+				"summary": "Updated a DynDNS host.",
+				"description": "Updates a predefined custom DNS entry.",
+				"operationId": "updateDynDNS",
+				"parameters": [
+					{
+						"name": "hostname",
+						"in": "path",
+						"required": true,
+						"schema": {
+							"type": "string"
+						}
+					}
+				],
+				"requestBody": {
+					"$ref": "#/components/requestBodies/dyndns-put"
+				},
+				"responses": {
+					"200": {
+						"description": "OK"
+					},
+					"401": {
+						"description": "API key is missing or invalid."
+					},
+					"404": {
+						"description": "Domain not found."
+					}
+				},
+				"security": [
+					{
+						"Authorization": []
+					}
+				]
+			}
+		},
 		"/domains": {
 			"get": {
 				"tags": [
@@ -250,6 +292,20 @@
 			}
 		},
 		"requestBodies": {
+			"dyndns-put": {
+				"required": true,
+				"content": {
+					"application/json": {
+						"schema": {
+							"$ref": "#/components/schemas/dyndns"
+						},
+						"example": {
+							"a": "1.2.3.4",
+							"aaaa": "1bad::babe"
+						}
+					}
+				}
+			},
 			"domain-post": {
 				"required": true,
 				"content": {
@@ -394,6 +450,20 @@
 					}
 				}
 			},
+			"dyndns": {
+				"type": "object",
+				"properties": {
+					"a": {
+						"type": "string",
+						"example": "1.2.3.4"
+					},
+					"aaaa": {
+						"type": "string",
+						"example": "1bad::babe"
+					}
+				}
+
+			},
 			"domain": {
 				"description": "Representation of a domain.\n",
 				"type": "object",