diff --git a/onnxruntime/core/providers/coreml/builders/model_builder.cc b/onnxruntime/core/providers/coreml/builders/model_builder.cc
index 6cc242c017d62..db2af3d4dddc1 100644
--- a/onnxruntime/core/providers/coreml/builders/model_builder.cc
+++ b/onnxruntime/core/providers/coreml/builders/model_builder.cc
@@ -410,6 +410,8 @@ std::string GetModelOutputPath(const CoreMLOptions& coreml_options,
     std::string_view cache_key = std::string_view(subgraph_name).substr(0, subgraph_name.find_first_of("_"));
     path = MakeString(std::string(coreml_options.ModelCachePath()), "/", cache_key);
     ORT_THROW_IF_ERROR(Env::Default().CreateFolder(path));
+    // Write the model path to a file in the cache directory.
+    // This is for developers to know what the cached model is as we used a hash for the directory name.
     if (!Env::Default().FileExists(ToPathString(path + "/model.txt"))) {
       const Graph* main_graph = &graph_viewer.GetGraph();
       while (main_graph->IsSubgraph()) {
@@ -422,7 +424,7 @@ std::string GetModelOutputPath(const CoreMLOptions& coreml_options,
     }
 
     path = MakeString(path, "/", subgraph_name);
-    // Set the model cache path with equireStaticShape and ModelFormat
+    // Set the model cache path with setting of RequireStaticShape and ModelFormat
     if (coreml_options.RequireStaticShape()) {
       path += "/static_shape";
     } else {
diff --git a/onnxruntime/core/providers/coreml/coreml_execution_provider.cc b/onnxruntime/core/providers/coreml/coreml_execution_provider.cc
index 9ea111a105cdb..fa725d5b2bd46 100644
--- a/onnxruntime/core/providers/coreml/coreml_execution_provider.cc
+++ b/onnxruntime/core/providers/coreml/coreml_execution_provider.cc
@@ -58,18 +58,22 @@ CoreMLExecutionProvider::GetCapability(const onnxruntime::GraphViewer& graph_vie
       [&]() {
         HashValue model_hash;
         int metadef_id = metadef_id_generator_.GenerateId(graph_viewer, model_hash);
-        std::string user_provide_key;
+        std::string user_provided_key;
         const Graph* main_graph = &graph_viewer.GetGraph();
         while (main_graph->IsSubgraph()) {
           main_graph = main_graph->ParentGraph();
         }
         if (main_graph->GetModel().MetaData().count("CACHE_KEY") > 0) {
-          user_provide_key = graph_viewer.GetGraph().GetModel().MetaData().at("CACHE_KEY");
+          user_provided_key = graph_viewer.GetGraph().GetModel().MetaData().at("CACHE_KEY");
         } else {
-          // model_hash is a 64-bit hash value of model_path
-          user_provide_key = std::to_string(model_hash);
+          // model_hash is a 64-bit hash value of model_path if model_path is not empty,
+          // otherwise it hashes the graph input names and all the node output names.
+          // it can't guarantee the uniqueness of the key, so user should manager the key by themselves for the best.
+          user_provided_key = std::to_string(model_hash);
         }
-        return MakeString(user_provide_key, "_", COREML, "_", model_hash, "_", metadef_id);
+        // The string format is used by onnxruntime/core/providers/coreml/builders/model_builder.cc::GetModelOutputPath
+        // If the format changes, the function should be updated accordingly.
+        return MakeString(user_provided_key, "_", COREML, "_", model_hash, "_", metadef_id);
       };
 
   result = utils::CreateSupportedPartitions(graph_viewer, supported_nodes, {},