diff --git a/README b/README
index 63e1dc2c..f6eaf2c0 100644
--- a/README
+++ b/README
@@ -456,7 +456,7 @@ modes, etc.
 
 Usage:
 
-  img2webp [file-level options] [image files...] [per-frame options...]
+  img2webp [file_options] [[frame_options] frame_file]...
 
 File-level options (only used at the start of compression):
  -min_size ............ minimize size
diff --git a/examples/img2webp.c b/examples/img2webp.c
index 3f1e59b6..94210923 100644
--- a/examples/img2webp.c
+++ b/examples/img2webp.c
@@ -35,8 +35,7 @@
 
 static void Help(void) {
   printf("Usage:\n\n");
-  printf("  img2webp [file-level options] [image files...] "
-         "[per-frame options...]\n");
+  printf("  img2webp [file_options] [[frame_options] frame_file]...\n");
   printf("\n");
 
   printf("File-level options (only used at the start of compression):\n");
diff --git a/man/img2webp.1 b/man/img2webp.1
index 50dc7882..892023c8 100644
--- a/man/img2webp.1
+++ b/man/img2webp.1
@@ -4,7 +4,7 @@
 img2webp \- create animated WebP file from a sequence of input images.
 .SH SYNOPSIS
 .B img2webp
-[file_level_options] [files] [per_frame_options...]
+[file_options] [[frame_options] frame_file]...
 .br
 .B img2webp argument_file_name
 .br