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-rw-r--r--ext/kgio/tryopen.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/kgio/tryopen.c b/ext/kgio/tryopen.c
index 902c745..76bb6b9 100644
--- a/ext/kgio/tryopen.c
+++ b/ext/kgio/tryopen.c
@@ -1,3 +1,4 @@
+/* We do not modify RSTRING in this file, so RSTRING_MODIFIED is not needed */
 #include <ruby.h>
 #ifdef HAVE_RUBY_IO_H
 #  include <ruby/io.h>