diff --git a/rtengine/dcraw.patch.README b/rtengine/dcraw.patch.README
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+Patch for vanilla dcraw.  Please run this against any new dcraw version copied here.
+ Instructions for patching:
+1) Download newest dcraw.c file, and copy to this folder.
+2) Run 'patch -p0 < dcraw.patch' to patch the file.  If there are any rejections, please fix them manually.
+3) Move the patched dcraw.c to dcraw.cc
+4) Re-copy the vanilla downloaded dcraw.c back to this folder, and update the patch: 'diff -u dcraw.c dcraw.cc > dcraw.patch'
+
+