--- a/README
+++ b/README
@@ -18,10 +18,14 @@
 These programs are build on top of the panorama tools library,
+The following external programs are required:
+1. enblend 3.1 or later
+2. exiftool from the Image::ExifTool perl module
 The following external programs are highly recommended:
-1. enblend
-2. autopano or autopano-sift
+1. autopano-sift-C, panomatic, autopano or autopano-sift
 hugin can be used to stitch multiple images together. The resulting image can
 span 360 degrees. Another common use is the creation of very high resolution