You can write comments documenting specific definition. Definition
comment has the asterisks doubled. The multi-line version must be
directly above the definition, the single-line on the same line right
-of the definition.
+of the definition or on a line before.
void function(int parameter); /** This is a function. **/
+or
+
+ /** This is a function. **/
+ void function(int parameter);
+
or
/**