diff --git a/data/event-schemas/schema/m.call.answer.yaml b/data/event-schemas/schema/m.call.answer.yaml
index 08058aed..be978387 100644
--- a/data/event-schemas/schema/m.call.answer.yaml
+++ b/data/event-schemas/schema/m.call.answer.yaml
@@ -34,7 +34,8 @@
                     "description": "The version of the VoIP specification this message adheres to. This specification is version 1. This field is a string such that experimental implementations can use non-integer versions. This field was an integer in the previous spec version and implementations must accept an integer 0"
                 },
                 "party_id": {
-                    "This identifies the party that sent this event. A client may choose to re-use the device ID from end-to-end cryptography for the value of this field. "
+                    "type": "string",
+                    "description": "This identifies the party that sent this event. A client may choose to re-use the device ID from end-to-end cryptography for the value of this field. "
                 }
             },
             "required": ["call_id", "answer", "version"]
diff --git a/data/event-schemas/schema/m.call.candidates.yaml b/data/event-schemas/schema/m.call.candidates.yaml
index 1ae83fca..dc328b95 100644
--- a/data/event-schemas/schema/m.call.candidates.yaml
+++ b/data/event-schemas/schema/m.call.candidates.yaml
@@ -36,7 +36,8 @@
                     }
                 },
                 "party_id": {
-                    "This identifies the party that sent this event. A client may choose to re-use the device ID from end-to-end cryptography for the value of this field. "
+                    "type": "string",
+                    "description": "This identifies the party that sent this event. A client may choose to re-use the device ID from end-to-end cryptography for the value of this field. "
                 },
                 "version": {
                     "type": "integer",
diff --git a/data/event-schemas/schema/m.call.hangup.yaml b/data/event-schemas/schema/m.call.hangup.yaml
index 7342f133..da871d36 100644
--- a/data/event-schemas/schema/m.call.hangup.yaml
+++ b/data/event-schemas/schema/m.call.hangup.yaml
@@ -17,7 +17,8 @@
                     "description": "The version of the VoIP specification this message adheres to. This specification is version 1. This field is a string such that experimental implementations can use non-integer versions. This field was an integer in the previous spec version and implementations must accept an integer 0."
                 },
                 "party_id": {
-                    "This identifies the party that sent this event. A client may choose to re-use the device ID from end-to-end cryptography for the value of this field. "
+                    "type": "string",
+                    "description": "This identifies the party that sent this event. A client may choose to re-use the device ID from end-to-end cryptography for the value of this field. "
                 },
                 "reason": {
                     "type": "string",
diff --git a/data/event-schemas/schema/m.call.invite.yaml b/data/event-schemas/schema/m.call.invite.yaml
index bbfcbcda..7f8618bf 100644
--- a/data/event-schemas/schema/m.call.invite.yaml
+++ b/data/event-schemas/schema/m.call.invite.yaml
@@ -34,7 +34,8 @@
                     "description": "The version of the VoIP specification this message adheres to. This specification is version 1. This field is a string such that experimental implementations can use non-integer versions. This field was an integer in the previous spec version and implementations must accept an integer 0."
                 },
                 "party_id": {
-                    "This identifies the party that sent this event. A client may choose to re-use the device ID from end-to-end cryptography for the value of this field. "
+                    "type": "string",
+                    "description": "This identifies the party that sent this event. A client may choose to re-use the device ID from end-to-end cryptography for the value of this field. "
                 },
                 "lifetime": {
                     "type": "integer",