1 files changed, 3 insertions, 1 deletions
diff --git a/tools/enum_parser/parse_enum/parse_enum.cpp b/tools/enum_parser/parse_enum/parse_enum.cpp
index 3db0d7a4d9a..80c5498ab7d 100644
--- a/tools/enum_parser/parse_enum/parse_enum.cpp
+++ b/tools/enum_parser/parse_enum/parse_enum.cpp
@@ -405,7 +405,9 @@ void TEnumParser::Parse(const char* data, size_t length) {
     const bool isFlatbuffersHeader = span.Contains("// automatically generated by the FlatBuffers compiler");
     Y_ENSURE(
         hasPragmaOnce || isProtobufHeader || isFlatbuffersHeader,
-        "Serialization functions can be generated only for enums in header files, see SEARCH-975. "
+        "Serialization functions can be generated only for enums in header files. "
+        "A valid header should either contain `#pragma once` or be an protobuf/flatbuf autogenerated header file. "
+        "See SEARCH-975 for more information. "
     );
     TCppContext cppContext(data, SourceFileName);
     TMemoryInput in(data, length);