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diff --git a/README b/README
index b23fcc1190c..91c5a1a8fa3 100644
--- a/README
+++ b/README
@@ -3425,6 +3425,10 @@ List of environment variables (most likely not complete):
mempos - Index position of the last match found by the 'ms' command,
in units of the size (.b, .w, .l) of the search
+ zbootbase - (x86 only) Base address of the bzImage 'setup' block
+
+ zbootaddr - (x86 only) Address of the loaded bzImage, typically
+ BZIMAGE_LOAD_ADDR which is 0x100000
The following image location variables contain the location of images
used in booting. The "Image" column gives the role of the image and is