docs/machine.Pin: Add note regarding irq handler argument.

6 years ago · 7de9211b80
1 changed files with 2 additions and 1 deletions
--- a/docs/library/machine.Pin.rst
+++ b/docs/library/machine.Pin.rst
@ -191,7 +191,8 @@ Methods
   The arguments are:

     - ``handler`` is an optional function to be called when the interrupt
-       triggers.
+       triggers. The handler must take exactly one argument which is the
+       ``Pin`` instance.

     - ``trigger`` configures the event which can generate an interrupt.
       Possible values are: