From 2b93727bea45406118bf6110aa8e725dc6d9f68b Mon Sep 17 00:00:00 2001
From: Mathieu Malaterre <mathieu.malaterre@gmail.com>
Date: Tue, 25 Mar 2014 10:22:40 +0000
Subject: [PATCH] [trunk] Add documentation

---
 tests/ppm2rgb3.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tests/ppm2rgb3.c b/tests/ppm2rgb3.c
index c9b4772a..58e7102c 100644
--- a/tests/ppm2rgb3.c
+++ b/tests/ppm2rgb3.c
@@ -120,7 +120,11 @@ int main(int argc, char *argv[])
   int X, Y, bpp;
   int ok = 0;
 
-  if( argc < 2 ) goto cleanup;
+  if( argc < 2 )
+    {
+    fprintf( stderr, "%s input.ppm\n", argv[0] );
+    goto cleanup;
+    }
   fn = argv[1];
   ppm = fopen( fn, "rb" );