diff --git a/ChangeLog b/ChangeLog
index 64a9776..9a9f294 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-06-05  Aleksey Demakov  <ademakov@gmail.com>
+
+	* include/jit/jit-function.h: add optimization level constants
+	JIT_OPTLEVEL_NONE and JIT_OPTLEVEL_NORMAL,
+
 2009-05-10  Aleksey Demakov  <ademakov@gmail.com>
 
 	* include/jit/jit-except.h (JIT_RESULT_UNDEFINED_LABEL):
diff --git a/include/jit/jit-function.h b/include/jit/jit-function.h
index 26429da..708b77d 100644
--- a/include/jit/jit-function.h
+++ b/include/jit/jit-function.h
@@ -27,6 +27,10 @@
 extern	"C" {
 #endif
 
+/* Optimization levels */
+#define JIT_OPTLEVEL_NONE	0
+#define JIT_OPTLEVEL_NORMAL	1
+
 jit_function_t jit_function_create
 	(jit_context_t context, jit_type_t signature) JIT_NOTHROW;
 jit_function_t jit_function_create_nested