diff --git a/src/drivers.py b/src/drivers.py
index 2c89dd49b..a16b28d29 100644
--- a/src/drivers.py
+++ b/src/drivers.py
@@ -191,6 +191,9 @@ def newDriver(irc, moduleName=None):
             import twistedDrivers
             moduleName = 'supybot.twistedDrivers'
         except ImportError:
+            # We formerly used 'del' here, but 2.4 fixes the bug that we added
+            # the 'del' for, so we need to make sure we don't complain if the
+            # module is cleaned up already.
             sys.modules.pop('supybot.twistedDrivers', None)
             moduleName = 'supybot.socketDrivers'
     elif not moduleName.startswith('supybot.'):