diff --git a/CHANGELOG.md b/CHANGELOG.md
index 206ec3f..39644bf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@
 [#x]: https://github.com/ideditor/schema-builder/issues/x
 -->
 
+# 6.0.1
+##### 2023-Jan-20
+
+* Fix bug in validation of `prerequisiteTag` values (v6.0.0 does falsely disallow requirements with only a `key` but neither `value` nor `valueNot`)
+
 # 6.0.0
 ##### 2023-Jan-20
 
diff --git a/package.json b/package.json
index 697f325..9d0d0df 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "type": "module",
   "name": "@ideditor/schema-builder",
-  "version": "6.0.0",
+  "version": "6.0.1",
   "description": "Framework for defining iD-compatible tagging models",
   "homepage": "https://github.com/ideditor/schema-builder#readme",
   "bugs": "https://github.com/ideditor/schema-builder/issues",
diff --git a/schemas/field.json b/schemas/field.json
index ba28345..d0fbca8 100644
--- a/schemas/field.json
+++ b/schemas/field.json
@@ -171,7 +171,19 @@
             "description": "Tagging constraint for showing this field in the editor",
             "oneOf": [
                 {
-                    "$id": "requires-key-is-value",
+                    "$id": "requires-key-any-value",
+                    "type": "object",
+                    "properties": {
+                        "key": {
+                            "description": "The key of the required tag",
+                            "type": "string",
+                            "required": true
+                        }
+                    },
+                    "additionalProperties": false
+                },
+                {
+                    "$id": "requires-key-equals-value",
                     "type": "object",
                     "properties": {
                         "key": {
@@ -181,13 +193,14 @@
                         },
                         "value": {
                             "description": "The value that the tag must have. (alternative to 'valueNot')",
-                            "type": "string"
+                            "type": "string",
+                            "required": true
                         }
                     },
                     "additionalProperties": false
                 },
                 {
-                    "$id": "requires-key-is-not-value",
+                    "$id": "requires-key-not-value",
                     "type": "object",
                     "properties": {
                         "key": {
@@ -197,7 +210,8 @@
                         },
                         "valueNot": {
                             "description": "The value that the tag cannot have. (alternative to 'value')",
-                            "type": "string"
+                            "type": "string",
+                            "required": true
                         }
                     },
                     "additionalProperties": false