diff --git a/include/shirakami/scheme.h b/include/shirakami/scheme.h
index 64f02603f..ea07d278b 100644
--- a/include/shirakami/scheme.h
+++ b/include/shirakami/scheme.h
@@ -343,10 +343,12 @@ enum class OP_TYPE : std::int32_t {
     BEGIN,
     COMMIT,
     DELETE,
+    DELSERT,
     INSERT,
     NONE,
     SCAN,
     SEARCH,
+    TOMBSTONE,
     UPDATE,
     UPSERT,
 };
@@ -362,6 +364,8 @@ inline constexpr std::string_view to_string_view(const OP_TYPE op) noexcept {
             return "COMMIT"sv;
         case OP_TYPE::DELETE:
             return "DELETE"sv;
+        case OP_TYPE::DELSERT:
+            return "DELETE"sv;
         case OP_TYPE::INSERT:
             return "INSERT"sv;
         case OP_TYPE::NONE:
@@ -370,6 +374,8 @@ inline constexpr std::string_view to_string_view(const OP_TYPE op) noexcept {
             return "SCAN"sv;
         case OP_TYPE::SEARCH:
             return "SEARCH"sv;
+        case OP_TYPE::TOMBSTONE:
+            return "TOMBSTONE"sv;
         case OP_TYPE::UPDATE:
             return "UPDATE"sv;
         case OP_TYPE::UPSERT: