1 files changed, 1 insertions, 0 deletions

diff --git a/readme.md b/readme.md
index 03e9cbe..50d6c28 100644
--- a/readme.md
+++ b/readme.md
@@ -311,6 +311,7 @@ Macro
 * **XBYAK64_GCC** is defined on 64bit gcc, cygwin
 * define **XBYAK_NO_OP_NAMES** on gcc without `-fno-operator-names`
 * define **XBYAK_ENABLE_OMITTED_OPERAND** if you use omitted destination such as `vaddps(xmm2, xmm3);`(duplicated in the future)
+* define **XBYAK_UNDEF_JNL** if Bessel function jnl is defined as macro
 
 Sample
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