diff --git a/extensions/openpower-pels/README.md b/extensions/openpower-pels/README.md
index 8c85c17..fac2373 100644
--- a/extensions/openpower-pels/README.md
+++ b/extensions/openpower-pels/README.md
@@ -203,7 +203,7 @@
     these device paths to FRU callout lists.  The errno value may influence the
     callout.
 
-    TBD: Which exact types of device paths are supported.
+    I2C, FSI, FSI-I2C, and FSI-SPI paths are supported.
 
     ```
     CALLOUT_DEVICE_PATH="/sys/bus/i2c/devices/3-0069"
@@ -216,7 +216,8 @@
     full device path isn't known.  It is similar to CALLOUT_DEVICE_PATH in that
     it will use data tables generated by the MRW to create the callouts.
 
-    CALLOUT_IIC_BUS is in the form "/dev/i2c-X" where X is the bus number.
+    CALLOUT_IIC_BUS is in the form "/dev/i2c-X" where X is the bus number, or
+    just the bus number by itself.
     CALLOUT_IIC_ADDR is the 7 bit address either as a decimal or a hex number
     if preceded with a "0x".