diff --git a/docs/reference/pins/set-pull.md b/docs/reference/pins/set-pull.md
index e8e22fc5..d9748da8 100644
--- a/docs/reference/pins/set-pull.md
+++ b/docs/reference/pins/set-pull.md
@@ -14,6 +14,8 @@ button press.
 pins.setPull(DigitalPin.P9, PinPullMode.PullDown);
 ```
 
+The pull-up and -down resistors are about 13kOhm.
+
 ### Parameters
 
 * ``name``: The @boardname@ hardware pin to configure (``P0``-``P20``)