added discussion

Core/Source/NSObject+DTRuntime.h

@@ -26,6 +26,7 @@
 /**
  Adds a new instance method to a class. All instances of this class will have this method.
  
+ The block captures `self` in the calling context. To allow access to the instance from within the block it is passed as parameter to the block.
  @param name The name of the method.
  @param The block to execute for the instance method, a pointer to the instance is passed as the only parameter.
  @returns `YES` if the operation was successful