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diff --git a/README.EXT b/README.EXT
index e5760c184a..3bdb9d280b 100644
--- a/README.EXT
+++ b/README.EXT
@@ -1282,6 +1282,11 @@ Means that type rb_io_t is provided.
Means that Symbols will be returned as method names, e.g.,
Module#methods, #singleton_methods and so on.
+ HAVE_RUBY_*_H
+
+Defined in ruby.h and means correspoinding header is available. For
+instance, when HAVE_RUBY_ST_H is defined you should use ruby/st.h not
+mere st.h.
Appendix C. Functions Available in extconf.rb