diff --git a/lib/zstd.h b/lib/zstd.h
index ea7b9ba6b..f34e4002a 100644
--- a/lib/zstd.h
+++ b/lib/zstd.h
@@ -1404,6 +1404,9 @@ ZSTDLIB_API ZSTD_CDict* ZSTD_createCDict_advanced(const void* dict, size_t dictS
                                                   ZSTD_compressionParameters cParams,
                                                   ZSTD_customMem customMem);
 
+/**
+ * TODO: document!
+ */
 ZSTDLIB_API ZSTD_CDict* ZSTD_createCDict_advanced2(const void* dict, size_t dictSize,
                                                   ZSTD_dictLoadMethod_e dictLoadMethod,
                                                   ZSTD_dictContentType_e dictContentType,