minor comment fixes
diff --git a/api_examples/README b/api_examples/README
index 9a3833e..3f4d548 100644
--- a/api_examples/README
+++ b/api_examples/README
@@ -18,7 +18,7 @@
 Shell API...
 
   magick.sh           A simple "magick" shell command (as above)
-  magick_script       As a "magick" script file
+  magick_script.mgk   As a "magick" script file
 
 MagickCLI API...