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-rw-r--r--source/lang/api/constants.rst1
1 files changed, 1 insertions, 0 deletions
diff --git a/source/lang/api/constants.rst b/source/lang/api/constants.rst
index 00c1a5c..3ba99f0 100644
--- a/source/lang/api/constants.rst
+++ b/source/lang/api/constants.rst
@@ -42,6 +42,7 @@ Note that the ``true`` and ``false`` constants are typed in lowercase;
unlike e.g. ``HIGH``, ``LOW``, ``INPUT``, and ``OUTPUT`` (which are
described below).
+.. _lang-pin-levels:
Pin Levels: HIGH and LOW
------------------------