diff --git a/common/json/json.h b/common/json/json.h
index 8b63b3b..3adff81 100644
--- a/common/json/json.h
+++ b/common/json/json.h
@@ -89,25 +89,30 @@ protected:
 	~json();
 
 public:
+	// parse/un-parse ...
 	bool attach_text(char* json_txt);
 	void clear(bool as_array = false);
 	std::string to_string(void);
 
+	// attributes ...
 	std::string& key(void);
 	bool is_array(void);
 	bool is_leaf_node(void);	// whether this object is a leaf node contains final value
+
+	// value access ...
 	bool get_value(const char* key, bool& val);
 	bool get_value(const char* key, int& val);
 	bool get_value(const char* key, double& val);
 	bool get_value(const char* key, std::string& val);
 	bool get_value(const char* key, json*& val);
 
+	// enumeration ...
 	size_t children(void);	// return children count if was object or array, or else -1 returned
 	json* child(size_t ind);
 	json* first_child(void);
 	json* next_child(void);
 
-	// change the item matched 'key', or else add a new item
+	// change the item matching 'key', otherwise add a new item
 	bool set_value(const char* key, bool val);
 	bool set_value(const char* key, int val);
 	bool set_value(const char* key, double val);