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-rw-r--r--ruby.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ruby.c b/ruby.c
index dfbf714..9637ea4 100644
--- a/ruby.c
+++ b/ruby.c
@@ -765,6 +765,7 @@ feature_option(const char *str, int len, void *arg, const unsigned int enable)
}
rb_warn("unknown argument for --%s: `%.*s'",
enable ? "enable" : "disable", len, str);
+ rb_warn("features are [gems, did-you-mean, rubyopt, frozen-string-literal].");
}
static void