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diff --git a/testsuite/gna/README b/testsuite/gna/README
index d5af291ac..293122f0c 100644
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+++ b/testsuite/gna/README
@@ -24,7 +24,7 @@ Here are some tips for portability.
they aren't (SIGPIPE doesn't exist) and reports errors.
So avoid program that may exit before reading all the input:
* instead of 'grep -q xxx', use 'grep xxx > /dev/null'
-- reference files use unix end of line. Use 'diff --strip-trailing-cr' to
+- reference files use unix end of line. Use 'diff_nocr' (from testenv.sh) to
compare expected output with a reference file.
- don't forget that executable files have a .exe suffix on windows, but most
cygwin tools transparently add the suffix.