diff --git a/include/vsag/constants.h b/include/vsag/constants.h
index 9c5c20ba..8ba3bdb2 100644
--- a/include/vsag/constants.h
+++ b/include/vsag/constants.h
@@ -101,5 +101,7 @@ extern const char* const HGRAPH_USE_REORDER;
 extern const char* const HGRAPH_BASE_QUANTIZATION_TYPE;
 extern const char* const HGRAPH_GRAPH_MAX_DEGREE;
 extern const char* const HGRAPH_BUILD_EF_CONSTRUCTION;
+extern const char* const HGRAPH_INIT_CAPACITY;
+extern const char* const HGRAPH_BUILD_THREAD_COUNT;
 
 }  // namespace vsag
diff --git a/src/constants.cpp b/src/constants.cpp
index 444b3f46..4c4190ca 100644
--- a/src/constants.cpp
+++ b/src/constants.cpp
@@ -102,5 +102,7 @@ const char* const HGRAPH_USE_REORDER = HGRAPH_USE_REORDER_KEY;
 const char* const HGRAPH_BASE_QUANTIZATION_TYPE = "base_quantization_type";
 const char* const HGRAPH_GRAPH_MAX_DEGREE = "max_degree";
 const char* const HGRAPH_BUILD_EF_CONSTRUCTION = "ef_construction";
+const char* const HGRAPH_INIT_CAPACITY = "hgraph_init_capacity";
+const char* const HGRAPH_BUILD_THREAD_COUNT = "build_thread_count";
 
 };  // namespace vsag
diff --git a/src/index/hgraph_zparameters.cpp b/src/index/hgraph_zparameters.cpp
index 42f8ad21..a10a6ecd 100644
--- a/src/index/hgraph_zparameters.cpp
+++ b/src/index/hgraph_zparameters.cpp
@@ -27,7 +27,9 @@ const std::unordered_map<std::string, std::vector<std::string>> HGraphParameters
     {{HGRAPH_USE_REORDER, {HGRAPH_USE_REORDER_KEY}},
      {HGRAPH_BASE_QUANTIZATION_TYPE, {HGRAPH_BASE_CODES_KEY, QUANTIZATION_TYPE_KEY}},
      {HGRAPH_GRAPH_MAX_DEGREE, {HGRAPH_GRAPH_KEY, GRAPH_PARAMS_KEY, GRAPH_PARAM_MAX_DEGREE}},
-     {HGRAPH_BUILD_EF_CONSTRUCTION, {BUILD_PARAMS_KEY, BUILD_EF_CONSTRUCTION}}};
+     {HGRAPH_BUILD_EF_CONSTRUCTION, {BUILD_PARAMS_KEY, BUILD_EF_CONSTRUCTION}},
+     {HGRAPH_INIT_CAPACITY, {HGRAPH_GRAPH_KEY, GRAPH_PARAMS_KEY, GRAPH_PARAM_INIT_MAX_CAPACITY}},
+     {HGRAPH_BUILD_THREAD_COUNT, {BUILD_PARAMS_KEY, BUILD_THREAD_COUNT}}};
 
 HGraphParameters::HGraphParameters(JsonType& hgraph_param, const IndexCommonParam& common_param)
     : common_param_(common_param) {