From f761ad5885dd2a7e3efdb17ca15f918bea7938c6 Mon Sep 17 00:00:00 2001
From: Davis King <davis@dlib.net>
Date: Fri, 16 Sep 2016 19:45:06 -0400
Subject: [PATCH] Added message about -h

---
 tools/imglab/src/main.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/imglab/src/main.cpp b/tools/imglab/src/main.cpp
index 4c5f4fb3f..59a04e485 100644
--- a/tools/imglab/src/main.cpp
+++ b/tools/imglab/src/main.cpp
@@ -1156,6 +1156,9 @@ int main(int argc, char** argv)
             }
             editor.wait_until_closed();
         }
+
+        cout << "Invalid command, give -h to see options." << endl;
+        return EXIT_FAILURE;
     }
     catch (exception& e)
     {