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diff --git a/doc/README.kconfig b/doc/README.kconfig
index cd549a8..3aad5b4 100644
--- a/doc/README.kconfig
+++ b/doc/README.kconfig
@@ -114,6 +114,13 @@ See below for how each configuration target works in U-Boot:
coalesced together with "<condition:>" prefix for each line as shown above.
This file can be used as an input of "defconfig" target.
+- <board>_config
+
+ This does not exist in Linux's Kconfig.
+ Prior to Kconfig, in U-Boot, "make <board>_config" was used for the
+ configuration. It is still supported for backward compatibility and
+ its behavior is the same as "make <board>_defconfig".
+
Migration steps to Kconfig
--------------------------