diff --git a/prototype/corfurl/src/corfurl.erl b/prototype/corfurl/src/corfurl.erl
index cfb8f82..660e419 100644
--- a/prototype/corfurl/src/corfurl.erl
+++ b/prototype/corfurl/src/corfurl.erl
@@ -261,6 +261,7 @@ trim_page(#proj{epoch=Epoch} = P, LPN) ->
 fill_or_trim_page([], _Epoch, _LPN, _Func) ->
     ok;
 fill_or_trim_page([H|T], Epoch, LPN, Func) ->
+    %% io:format(user, "~s.erl line ~w: TODO: this 'fill or trim' logic is probably stupid, due to mis-remembering the CORFU paper, sorry!  Commenting out this warning line is OK, if you wish to proceed with testing Corfurl.  This code can change a fill into a trim.  Those things are supposed to be separate, silly me, a fill should never automagically change to a trim.\n", [?MODULE, ?LINE]),
     case corfurl_flu:Func(flu_pid(H), Epoch, LPN) of
         Res when Res == ok; Res == error_trimmed ->
             %% Detecting a race here between fills and trims is too crazy,
diff --git a/prototype/corfurl/src/corfurl_flu.erl b/prototype/corfurl/src/corfurl_flu.erl
index 759afca..c092761 100644
--- a/prototype/corfurl/src/corfurl_flu.erl
+++ b/prototype/corfurl/src/corfurl_flu.erl
@@ -213,6 +213,7 @@ handle_call({{fill, ClientEpoch, _LogicalPN}, LC1}, _From,
     {reply, {error_badepoch, LC2}, State};
 handle_call({{fill, _ClientEpoch, LogicalPN}, LC1}, _From, State) ->
     LC2 = lclock_update(LC1),
+    io:format(user, "~s.erl line ~w: TODO: this 'fill or trim' logic is probably stupid, due to mis-remembering the CORFU paper, sorry!  Commenting out this warning line is OK, if you wish to proceed with testing Corfurl.  This code can change a fill into a trim.  Those things are supposed to be separate, silly me, a fill should never automagically change to a trim.\n", [?MODULE, ?LINE]),
     {Reply, NewState} = do_trim_or_fill(fill, LogicalPN, State),
     ?EVENT_LOG({flu, fill, self(), LogicalPN, Reply}),
     {reply, {Reply, LC2}, NewState};