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--- a/src/utils/fstreewalk.h
+++ b/src/utils/fstreewalk.h
@@ -39,6 +39,9 @@
  */
 class FsTreeWalker {
  public:
+    // Flags for call to processone(). FtwDirEnter is used when
+    // entering a directory. FtwDirReturn is used when returning to it
+    // after processing a subdirectory.
     enum CbFlag {FtwRegular, FtwDirEnter, FtwDirReturn};
     enum Status {FtwOk=0, FtwError=1, FtwStop=2, 
 		 FtwStatAll = FtwError|FtwStop};