Index: llvm/include/llvm/Analysis/LoopInfo.h
===================================================================
--- llvm/include/llvm/Analysis/LoopInfo.h
+++ llvm/include/llvm/Analysis/LoopInfo.h
@@ -155,6 +155,7 @@
   iterator end() const { return getSubLoops().end(); }
   reverse_iterator rbegin() const { return getSubLoops().rbegin(); }
   reverse_iterator rend() const { return getSubLoops().rend(); }
+  // Return true if it does not contain any loops.
   bool empty() const { return getSubLoops().empty(); }
 
   /// Get a list of the basic blocks which make up this loop.