diff --git a/layout/generic/nsBlockFrame.cpp b/layout/generic/nsBlockFrame.cpp
index 8da4bd341b79..12ff95a5f852 100644
--- a/layout/generic/nsBlockFrame.cpp
+++ b/layout/generic/nsBlockFrame.cpp
@@ -4427,9 +4427,6 @@ nsBlockFrame::DrainSelfOverflowList()
   return true;
 }
 
-// This function assumes our prev-in-flow has completed reflow and its
-// mFloats may contain frames at the end of its float list, marked with
-// NS_FRAME_IS_PUSHED_FLOAT, that should be pulled to this block.
 void
 nsBlockFrame::DrainPushedFloats(nsBlockReflowState& aState)
 {
@@ -4442,7 +4439,8 @@ nsBlockFrame::DrainPushedFloats(nsBlockReflowState& aState)
   nsLayoutUtils::AssertNoDuplicateContinuations(this, mFloats);
 #endif
 
-  // Take any continuations we need to take from our prev-in-flow.
+  // After our prev-in-flow has completed reflow, it may have a pushed
+  // floats list, containing floats that we need to own.  Take these.
   nsBlockFrame* prevBlock = static_cast<nsBlockFrame*>(GetPrevInFlow());
   if (!prevBlock)
     return;