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-rw-r--r--doc/README.POST8
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diff --git a/doc/README.POST b/doc/README.POST
index 695497e..6815d49 100644
--- a/doc/README.POST
+++ b/doc/README.POST
@@ -665,6 +665,14 @@ listed in CONFIG_SYS_POST_I2C_ADDRS are found, and no additional
devices are detected. If CONFIG_SYS_POST_I2C_ADDRS is not defined
the test will pass if any I2C device is found.
+The CONFIG_SYS_POST_I2C_IGNORES define can be used to list I2C
+devices which may or may not be present when using
+CONFIG_SYS_POST_I2C_ADDRS. The I2C POST test will pass regardless
+if the devices in CONFIG_SYS_POST_I2C_IGNORES are found or not.
+This is useful in cases when I2C devices are optional (eg on a
+daughtercard that may or may not be present) or not critical
+to board operation.
+
2.2.2.2. Watchdog timer test
To test the watchdog timer the scheme mentioned above (refer to