diff --git a/mozilla/layout/generic/nsBlockReflowState.h b/mozilla/layout/generic/nsBlockReflowState.h
index a3e744d41b2..66bc509307c 100644
--- a/mozilla/layout/generic/nsBlockReflowState.h
+++ b/mozilla/layout/generic/nsBlockReflowState.h
@@ -85,8 +85,11 @@ public:
 
   PRBool PlaceBelowCurrentLineFloaters(nsFloaterCacheList& aFloaters);
 
+  // called when clearing a line with a break type caused by a BR past
+  // floats, and also used internally by ClearPastFloaters
   void ClearFloaters(nscoord aY, PRUint8 aBreakType);
 
+  // called when clearing a block past floats
   PRBool ClearPastFloaters(PRUint8 aBreakType);
 
   PRBool IsAdjacentWithTop() const {
diff --git a/mozilla/layout/html/base/src/nsBlockReflowState.h b/mozilla/layout/html/base/src/nsBlockReflowState.h
index a3e744d41b2..66bc509307c 100644
--- a/mozilla/layout/html/base/src/nsBlockReflowState.h
+++ b/mozilla/layout/html/base/src/nsBlockReflowState.h
@@ -85,8 +85,11 @@ public:
 
   PRBool PlaceBelowCurrentLineFloaters(nsFloaterCacheList& aFloaters);
 
+  // called when clearing a line with a break type caused by a BR past
+  // floats, and also used internally by ClearPastFloaters
   void ClearFloaters(nscoord aY, PRUint8 aBreakType);
 
+  // called when clearing a block past floats
   PRBool ClearPastFloaters(PRUint8 aBreakType);
 
   PRBool IsAdjacentWithTop() const {