diff --git a/README b/README
index 67dc444..bb1b725 100644
--- a/README
+++ b/README
@@ -374,6 +374,15 @@
 		Defines the string to utilize when trying to match PCIe device
 		tree nodes for the given platform.
 
+		CONFIG_SYS_PPC_E500_DEBUG_TLB
+
+		Enables a temporary TLB entry to be used during boot to work
+		around limitations in e500v1 and e500v2 external debugger
+		support. This reduces the portions of the boot code where
+		breakpoints and single stepping do not work.  The value of this
+		symbol should be set to the TLB1 entry to be used for this
+		purpose.
+
 - Generic CPU options:
 		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN