diff --git a/slic3r.pl b/slic3r.pl
index 6823f00ce..ef6101ec0 100755
--- a/slic3r.pl
+++ b/slic3r.pl
@@ -104,7 +104,7 @@ Usage: slic3r.pl [ OPTIONS ] file.stl
                         --output-filename-format to generate the filename)
     
   Output options:
-    --output-filament-format
+    --output-filename-format
                         Output file name format; all config options enclosed in brackets
                         will be replaced by their values, as well as [input_filename_base]
                         and [input_filename] (default: $Slic3r::output_filename_format)