1 files changed, 5 insertions, 0 deletions

diff --git a/xdelta3/xdelta3-main.h b/xdelta3/xdelta3-main.h
index 32295d4..986165b 100644
--- a/xdelta3/xdelta3-main.h
+++ b/xdelta3/xdelta3-main.h
@@ -3316,6 +3316,11 @@ main_input (xd3_cmd     cmd,
         default:
           /* input_func() error */
           XPR(NT XD3_LIB_ERRMSG (& stream, ret));
+          if (! option_quiet && ret == XD3_INVALID_INPUT)
+            {
+              XPR(NT "normally this indicates that the source file is incorrect\n");
+              XPR(NT "please verify the source file with sha1sum or equivalent\n");
+            }
           return EXIT_FAILURE;
         }
     }