diff --git a/spec.yml b/spec.yml
index 99f8852c2c1..e864a6c7d9c 100644
--- a/spec.yml
+++ b/spec.yml
@@ -546,8 +546,7 @@ records:
      # server_requests_action:
      #   type: sync::ProtocolErrorInfo::Action
      #   default: sync::ProtocolErrorInfo::Action::NoAction
-     # compensating_writes_info: std::vector<sync::CompensatingWriteErrorInfo>
-
+     compensating_writes_info: std::vector<CompensatingWriteErrorInfo>
 
   Request:
     cppName: app::Request
@@ -591,6 +590,13 @@ records:
       default_request_timeout_ms: util::Optional<uint64_t>
       device_info: DeviceInfo
 
+  CompensatingWriteErrorInfo:
+   cppName: sync::CompensatingWriteErrorInfo
+   fields:
+     object_name: std::string
+     reason: std::string
+     primary_key: Mixed
+
 opaqueTypes:
   - Schema
   - Group