diff --git a/ChangeLog b/ChangeLog
index 7771da16c6..78f3796797 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Mar 17 06:39:59 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ruby.h (rb_warning, rb_sys_warning): fixed typo in rdoc.
+	  [ruby-core:28696]
+
 Wed Mar 17 02:29:46 2010  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* compile.c, iseq.c, ruby.c, vm.c, vm_core.h, vm_eval.c: add absolute
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index d56d42c86e..71205dcf05 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -1108,7 +1108,7 @@ NORETURN(void rb_iter_break(void));
 NORETURN(void rb_exit(int));
 NORETURN(void rb_notimplement(void));
 
-/* reports if `-w' specified */
+/* reports if `-W' specified */
 PRINTF_ARGS(void rb_warning(const char*, ...), 1, 2);
 PRINTF_ARGS(void rb_compile_warning(const char *, int, const char*, ...), 3, 4);
 PRINTF_ARGS(void rb_sys_warning(const char*, ...), 1, 2);