improve comments (poller.py)

secop/poller.py

@@ -227,9 +227,10 @@ class Poller(PollerBase):
         (where n is the number of regular parameters).
         """
         if not self:
-            # nothing to do (else we might call time.sleep(float('inf')) below
+            # nothing to do (else time.sleep(float('inf')) might be called below
             started_callback()
             return
+        # if writeInitParams is not yet done, we do it here
         for module in self.modules:
             module.writeInitParams()
         # do all polls once and, at the same time, insert due info