--- a/layout/generic/nsBlockFrame.cpp
+++ b/layout/generic/nsBlockFrame.cpp
@@ -3168,17 +3168,17 @@ nsBlockFrame::ReflowInlineFrames(nsBlock
       aState.mReflowState.mSpaceManager->PushState(&spaceManagerState);
 
       // Once upon a time we allocated the first 30 nsLineLayout objects
       // on the stack, and then we switched to the heap.  At that time
       // these objects were large (1100 bytes on a 32 bit system).
       // Then the nsLineLayout object was shrunk to 156 bytes by
       // removing some internal buffers.  Given that it is so much
       // smaller, the complexity of 2 different ways of allocating
-      // no longer makes sense.  Now we always allocate on the stack
+      // no longer makes sense.  Now we always allocate on the stack.
       nsLineLayout lineLayout(aState.mPresContext,
                               aState.mReflowState.mSpaceManager,
                               &aState.mReflowState, &aLine);
       lineLayout.Init(&aState, aState.mMinLineHeight, aState.mLineNumber);
       if (forceBreakInContent) {
         lineLayout.ForceBreakAtPosition(forceBreakInContent, forceBreakOffset);
       }
       rv = DoReflowInlineFrames(aState, lineLayout, aLine,