readme update

README.md

@@ -186,15 +186,15 @@ render({{ divisibleBy(42, 7) }}, data); // true
 
 ### Callbacks
 
-You can create your own functions with callbacks. They can be added to the environment like
+You can create your own and more complex functions with callbacks.
 ```c++
 Environment env = Environment();
 
 /*
  * Callbacks are defined by its:
- * - name, which is equal to its function name
+ * - name, which is equal to the function name
  * - number of arguments
- * - callback function. Using std::function, you can e.g. also use lambdas.
+ * - callback function. Implemented with std::function, you can for example use lambdas.
  */
 env.add_callback("double", 1, [&env](Parsed::Arguments args, json data) {
 	const int number = env.renderer.eval_expression<int>(args[0], data); // Adapt the type and index of the argument
@@ -204,7 +204,7 @@ env.add_callback("double", 1, [&env](Parsed::Arguments args, json data) {
 // You can then use a callback like a regular function
 env.render("{{ double(16) }}", data) // "32"
 
-// A callback without argument can be used like a variable:
+// A callback without argument can be used like a dynamic variable:
 std::string greet = "Hello";
 env.add_callback("double-greetings", 0, [&env, greet](Parsed::Arguments args, json data) {
 	return greet + " " + greet + "!";