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diff --git a/ao-tools/ao-chaosread/ao-chaosread.1 b/ao-tools/ao-chaosread/ao-chaosread.1
index e6ed2fac..94ca5ce9 100644
--- a/ao-tools/ao-chaosread/ao-chaosread.1
+++ b/ao-tools/ao-chaosread/ao-chaosread.1
@@ -47,6 +47,12 @@ from the noise source.
.TP
\-r | --raw
Read raw data from the noise source. This is the default.
+.TP
+\-f | --flash
+Read the contents of flash memory on the device. This loops through
+flash memory, so you can read the contents more than once, but there's
+no way to reset the pointer back to the start other than making sure
+you read the whole contents.
.SH USAGE
.I ao-chaosread
reads noise data.