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diff --git a/doc/arch/sandbox.rst b/doc/arch/sandbox.rst
index 1a7801af02..60ee1e0741 100644
--- a/doc/arch/sandbox.rst
+++ b/doc/arch/sandbox.rst
@@ -131,6 +131,13 @@ available options. Some of these are described below:
-i
Go to interactive mode after executing the commands specified by -c.
+Environment Variables
+---------------------
+
+UBOOT_SB_TIME_OFFSET
+ This environment variable stores the offset of the emulated real time clock
+ to the host's real time clock in seconds. The offset defaults to zero.
+
Memory Emulation
----------------