diff --git a/docs/wasp.rst b/docs/wasp.rst
index efe57b9..18c0803 100644
--- a/docs/wasp.rst
+++ b/docs/wasp.rst
@@ -44,7 +44,6 @@ Device drivers
 
 .. automodule:: drivers.nrf_rtc
    :members:
-   :undoc-members:
 
 .. automodule:: drivers.signal
    :members:
diff --git a/wasp/drivers/nrf_rtc.py b/wasp/drivers/nrf_rtc.py
index dcce996..222be32 100644
--- a/wasp/drivers/nrf_rtc.py
+++ b/wasp/drivers/nrf_rtc.py
@@ -1,7 +1,9 @@
 # SPDX-License-Identifier: LGPL-3.0-or-later
 # Copyright (C) 2020 Daniel Thompson
 
-""" Real Time Clock based on the nRF-family low power counter """
+"""nRF-family RTC driver
+~~~~~~~~~~~~~~~~~~~~~~~~
+"""
 
 import machine
 import time
@@ -17,9 +19,19 @@ import time
 #        return self.c
 
 class RTC(object):
-    """Real Time Clock based on the nRF-family low power counter."""
+    """Real Time Clock based on the nRF-family low power counter.
+
+    .. automethod:: __init__
+    """
 
     def __init__(self, counter):
+        """Wrap an RTCounter to provide a fully fledged Real Time Clock.
+
+        If the PNVRAM is valid then we use it to initialize the RTC otherwise
+        we just make something up.
+
+        :param RTCounter counter: The RTCCounter channel to adopt.
+        """
         self.counter = counter
 
         if machine.mem32[0x200039c0] == 0x1abe11ed and \
@@ -34,6 +46,10 @@ class RTC(object):
             self.set_localtime((2020, 3, 1, 3, 0, 0, 0, 0))
 
     def update(self):
+        """Check for counter updates.
+
+        :returns: True of the wall time has changed, False otherwise.
+        """
         newcount = self.counter.counter()
         split = newcount - self.lastcount
         if split == 0:
@@ -49,6 +65,12 @@ class RTC(object):
         return True
 
     def set_localtime(self, t):
+        """Set the current wall time.
+
+        :param sequence t:
+                Wall time formatted as (yyyy, mm, dd, HH, MM, SS), any
+                additional elements in sequence will be ignored.
+        """
         self.lastcount = self.counter.counter()
 
         if len(t) < 8:
@@ -66,10 +88,18 @@ class RTC(object):
         machine.mem32[0x200039c4] = self.offset
 
     def get_localtime(self):
+        """Get the current time and date.
+
+        :returns: Wall time formatted as (yyyy, mm, dd, HH, MM, SS, wday, yday)
+        """
         self.update()
         return time.localtime(self.offset + (self._uptime >> 3))
 
     def get_time(self):
+        """Get the current time.
+
+        :returns: Wall time formatted as (HH, MM, SS)
+        """
         localtime = self.get_localtime()
         return localtime[3:6]