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-rw-r--r--source/lang/api/isbuttonpressed.rst5
1 files changed, 4 insertions, 1 deletions
diff --git a/source/lang/api/isbuttonpressed.rst b/source/lang/api/isbuttonpressed.rst
index dbff0c9..8c350b9 100644
--- a/source/lang/api/isbuttonpressed.rst
+++ b/source/lang/api/isbuttonpressed.rst
@@ -4,7 +4,8 @@ isButtonPressed()
=================
Check whether the board's built-in button (labeled BUT on the
-silkscreen) is pressed.
+silkscreen) is pressed. The pin number of the built-in button is
+given by the constant ``BOARD_BUTTON_PIN``.
Library Documentation
---------------------
@@ -14,4 +15,6 @@ Library Documentation
See Also
--------
+- :ref:`Board-specific values <lang-board-values>`
+- :ref:`BOARD_BUTTON_PIN <lang-board-values-but>`
- :ref:`lang-waitforbuttonpress`