diff --git a/doc/README.gpt b/doc/README.gpt
index 3fcd83557f99bee1ec60d62646b9bc3c99c49951..c0acc8ade5c72afdc0e0ec6936be8b94b093ff69 100644
--- a/doc/README.gpt
+++ b/doc/README.gpt
@@ -210,6 +210,16 @@ U-BOOT> gpt verify mmc 0 $partitions
 U-BOOT> if test $? = 0; then echo "GPT OK"; else echo "GPT ERR"; fi
 
 
+The GPT functionality may be tested with the 'sandbox' board by
+creating a disk image as described under 'Block Device Emulation' in
+board/sandbox/README.sandbox:
+
+=>host bind 0 ./disk.raw
+=> gpt read host 0
+[ . . . ]
+=> gpt flip host 0
+[ . . . ]
+
 Partition type GUID:
 ====================