diff --git a/boards/arm/lpcxpresso55s36/doc/index.rst b/boards/arm/lpcxpresso55s36/doc/index.rst
index e4498be0049..01bade69d25 100644
--- a/boards/arm/lpcxpresso55s36/doc/index.rst
+++ b/boards/arm/lpcxpresso55s36/doc/index.rst
@@ -77,6 +77,8 @@ already supported, which can also be re-used on this lpcxpresso55s36 board:
 +-----------+------------+-------------------------------------+
 | PWM       | on-chip    | pwm                                 |
 +-----------+------------+-------------------------------------+
+| CSS       | on-chip    | entropy                             |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not currently enabled.