diff --git a/docs/library/machine.Pin.rst b/docs/library/machine.Pin.rst
index a355a6f7c..5254e163c 100644
--- a/docs/library/machine.Pin.rst
+++ b/docs/library/machine.Pin.rst
@@ -235,6 +235,7 @@ not all constants are available on all ports.
 
 .. data:: Pin.PULL_UP
           Pin.PULL_DOWN
+          Pin.PULL_HOLD
 
    Selects whether there is a pull up/down resistor.  Use the value
    ``None`` for no pull.