diff --git a/piker/clearing/_allocate.py b/piker/clearing/_allocate.py
index 999f9ff9..94c7af12 100644
--- a/piker/clearing/_allocate.py
+++ b/piker/clearing/_allocate.py
@@ -134,6 +134,10 @@ class Allocator(BaseModel):
     def next_order_info(
         self,
 
+        # we only need a startup size for exit calcs, we can the
+        # determine how large slots should be if the initial pp size was
+        # larger then the current live one, and the live one is smaller
+        # then the initial config settings.
         startup_pp: Position,
         live_pp: Position,
         price: float,
@@ -191,9 +195,13 @@ class Allocator(BaseModel):
             else:
                 slot_size = u_per_slot
 
+            # TODO: ensure that the limit can never be set **lower**
+            # then the current pp size? It should be configured
+            # correctly at startup right?
+
             # if our position is greater then our limit setting
             # we'll want to use slot sizes which are larger then what
-            # the limit would normally determine
+            # the limit would normally determine.
             order_size = max(slotted_pp, slot_size)
 
             if (
diff --git a/piker/ui/_position.py b/piker/ui/_position.py
index db250625..225663bc 100644
--- a/piker/ui/_position.py
+++ b/piker/ui/_position.py
@@ -75,10 +75,10 @@ class SettingsPane:
         log.info(f'selection input: {value}')
         mode = self.order_mode
 
+        # an account switch request
         if key == 'account':
-            # an account switch request
 
-            # hide detail on the old pp
+            # hide details on the old selection
             old_tracker = mode.current_pp
             old_tracker.hide_info()
 
@@ -86,6 +86,9 @@ class SettingsPane:
             account_name = value
             tracker = mode.trackers.get(account_name)
 
+            # if selection can't be found (likely never discovered with
+            # a ``brokerd`) then error and switch back to the last
+            # selection.
             if tracker is None:
                 sym = old_tracker.chart.linked.symbol.key
                 log.error(