diff --git a/docs/library/machine.rst b/docs/library/machine.rst
index 05927e5b42..3af86db819 100644
--- a/docs/library/machine.rst
+++ b/docs/library/machine.rst
@@ -18,23 +18,25 @@ Reset related functions
 
    Get the reset cause. See :ref:`constants <machine_constants>` for the possible return values.
 
-Interrupt related functions
----------------------------
+.. only:: port_wipy
 
-.. function:: disable_irq()
+    Interrupt related functions
+    ---------------------------
 
-   Disable interrupt requests.
-   Returns the previous IRQ state: ``False``/``True`` for disabled/enabled IRQs
-   respectively.  This return value can be passed to enable_irq to restore
-   the IRQ to its original state.
+    .. function:: disable_irq()
 
-.. function:: enable_irq(state=True)
+       Disable interrupt requests.
+       Returns the previous IRQ state: ``False``/``True`` for disabled/enabled IRQs
+       respectively.  This return value can be passed to enable_irq to restore
+       the IRQ to its original state.
 
-   Enable interrupt requests.
-   If ``state`` is ``True`` (the default value) then IRQs are enabled.
-   If ``state`` is ``False`` then IRQs are disabled.  The most common use of
-   this function is to pass it the value returned by ``disable_irq`` to
-   exit a critical section.
+    .. function:: enable_irq(state=True)
+
+       Enable interrupt requests.
+       If ``state`` is ``True`` (the default value) then IRQs are enabled.
+       If ``state`` is ``False`` then IRQs are disabled.  The most common use of
+       this function is to pass it the value returned by ``disable_irq`` to
+       exit a critical section.
 
 Power related functions
 -----------------------
@@ -69,31 +71,37 @@ Power related functions
 
    Stops the CPU and all peripherals including WLAN. Execution is resumed from main, just
    as with a reset. The reset cause can be checked to know that we are coming from
-   from ``machine.DEEPSLEEP``. Wake sources are ``Pin`` and ``RTC``. Current consumption 
+   ``machine.DEEPSLEEP``. Wake sources are ``Pin`` and ``RTC``. Current consumption 
    is reduced to ~5uA.
 
-.. function:: wake_reason()
+.. only:: port_wipy
 
-   Get the wake reason. See :ref:`constants <machine_constants>` for the possible return values.
+    .. function:: wake_reason()
+
+        Get the wake reason. See :ref:`constants <machine_constants>` for the possible return values.
 
 Miscellaneous functions
 -----------------------
 
-.. function:: main(filename)
+.. only:: port_wipy
 
-   Set the filename of the main script to run after boot.py is finished.  If
-   this function is not called then the default file main.py will be executed.
+    .. function:: main(filename)
 
-   It only makes sense to call this function from within boot.py.
+        Set the filename of the main script to run after boot.py is finished.  If
+        this function is not called then the default file main.py will be executed.
 
-.. function:: rng()
+        It only makes sense to call this function from within boot.py.
 
-   Return a 24-bit software generated random number.
+    .. function:: rng()
+
+        Return a 24-bit software generated random number.
 
 .. function:: unique_id()
 
-   Returns a string of 6 bytes (48 bits), which is the unique ID of the MCU.
-   This also corresponds to the network ``MAC address``.
+   Returns a byte string with a unique idenifier of a board/SoC. It will vary
+   from a board/SoC instance to another, if underlying hardware allows. Length
+   varies by hardware (so use substring of a full value if you expect a short
+   ID). In some MicroPython ports, ID corresponds to the network MAC address.
 
 .. _machine_constants: