diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
index 5f81e2a24a5c..184a7a222701 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -221,6 +221,7 @@ Code  Seq#    Include File                                           Comments
 'a'   00-0F  drivers/crypto/qat/qat_common/adf_cfg_common.h          conflict! qat driver
 'b'   00-FF                                                          conflict! bit3 vme host bridge
                                                                      <mailto:natalia@nikhefk.nikhef.nl>
+'b'   00-0F  linux/dma-buf.h                                         conflict!
 'c'   all    linux/cm4000_cs.h                                       conflict!
 'c'   00-7F  linux/comstats.h                                        conflict!
 'c'   00-7F  linux/coda.h                                            conflict!