diff --git a/libubb/README b/libubb/README
index 1ef7c83..870bcaa 100644
--- a/libubb/README
+++ b/libubb/README
@@ -121,3 +121,29 @@ Access to timers, interrupts, etc.
 include/ubb/regs4740.h gives access to even more registers.
 Please consult the JZ4740 Programming Manual for details on
 their use.
+
+
+Competing users of the 8:10 card interface
+------------------------------------------
+
+Other programs and kernel drivers may compete for access to the
+8:10 card interface. The most common conflicts are with the
+kernel drivers for MMC (uSD card) and AT86RF230 (atben).
+
+OpenWRT and JLime start with the MMC driver loaded and active.
+
+To detach the MMC driver, run
+
+# echo jz4740-mmc.0 >/sys/bus/platform/drivers/jz4740-mmc/unbind
+
+To re-attach the MMC driver, run
+
+# echo jz4740-mmc.0 >/sys/bus/platform/drivers/jz4740-mmc/bind
+
+To detach the AT86RF230 driver, run
+
+# cd /sys/bus/spi/drivers/at86rf230
+# echo spi*.0 >unbind
+
+libubb allows multiple programs to open UBB at the same time,
+leaving it up to these programs to coordinate their access.