diff --git a/smbus2/smbus2.py b/smbus2/smbus2.py
index 2426e03..9ad3679 100644
--- a/smbus2/smbus2.py
+++ b/smbus2/smbus2.py
@@ -335,6 +335,9 @@ def enable_pec(self, enable=True):
         ioctl(self.fd, I2C_PEC, self._pec)
 
     pec = property(_get_pec, enable_pec)  # Drop-in replacement for smbus member "pec"
+    """
+    Get and set SMBus PEC. 0 = disabled (default), 1 = enabled.
+    """
 
     def _set_address(self, address, force=None):
         """