diff --git a/layout/generic/nsFlexContainerFrame.h b/layout/generic/nsFlexContainerFrame.h
index e7153f3218f1..58a679c0f7ba 100644
--- a/layout/generic/nsFlexContainerFrame.h
+++ b/layout/generic/nsFlexContainerFrame.h
@@ -111,8 +111,8 @@ protected:
   // Cached values from running flexbox layout algorithm, used in setting our
   // reflow metrics w/out actually reflowing all of our children, in any
   // reflows where we're not dirty:
-  nscoord mCachedContentBoxCrossSize; // cross size of our content-box size
-  nscoord mCachedAscent;              // our ascent, in prev. reflow.
+  nscoord mCachedContentBoxCrossSize; // Cross size of our content-box.
+  nscoord mCachedAscent;              // Our ascent, in prev. reflow.
 };
 
 #endif /* nsFlexContainerFrame_h___ */