diff --git a/object/service.proto b/object/service.proto
index 1d08ff5..fae833e 100644
--- a/object/service.proto
+++ b/object/service.proto
@@ -101,6 +101,9 @@ service ObjectService {
   // - Common failures (SECTION_FAILURE_COMMON);
   // - **ACCESS_DENIED** (2048, SECTION_OBJECT): \
   //   delete access to the object is denied;
+  // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT): \
+  //   the object could not be deleted because it has not been \
+  //   found within the container;
   // - **LOCKED** (2050, SECTION_OBJECT): \
   //   deleting a locked object is prohibited;
   // - **CONTAINER_NOT_FOUND** (3072, SECTION_CONTAINER): \