added comment.

1 files changed, 1 insertions, 1 deletions

diff --git a/permute.cpp b/permute.cpp
index 0829550..ba89e72 100644
--- a/permute.cpp
+++ b/permute.cpp
@@ -30,7 +30,7 @@ void do_permute(const string& pool, string& perm, vector<string>& perms)
                 tmp.push_back(pool[j]);
         }
         do_permute(tmp, perm, perms);
-        perm.resize(perm.size()-1);
+        perm.resize(perm.size()-1); // pop back one character.
     }
 }