diff --git a/ChangeLog b/ChangeLog
index e07127f3e0..d43b824ee9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Oct 19 07:37:13 2008  Tadayoshi Funaba  <tadf@dotrb.org>
+
+	* lib/cmath.rb (log2,cbrt,frexp,ldexp,hypot,erf,erfc,gamma,lgamma):
+	  should be also privided as module function.  [ruby-dev:36787]
+
 Sun Oct 19 07:25:08 2008  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
 
 	* keywords, lex.c.src, opt_insn_unif.def, opt_operand.def: moved rarely changed
diff --git a/lib/cmath.rb b/lib/cmath.rb
index d293401804..00bcc9087f 100644
--- a/lib/cmath.rb
+++ b/lib/cmath.rb
@@ -220,4 +220,14 @@ module CMath
   module_function :atanh!
   module_function :atanh
 
+  module_function :log2
+  module_function :cbrt
+  module_function :frexp
+  module_function :ldexp
+  module_function :hypot
+  module_function :erf
+  module_function :erfc
+  module_function :gamma
+  module_function :lgamma
+
 end