diff --git a/src/luks/clevis-luks-unlock.1.adoc b/src/luks/clevis-luks-unlock.1.adoc
index 12fde9c1..72581b69 100644
--- a/src/luks/clevis-luks-unlock.1.adoc
+++ b/src/luks/clevis-luks-unlock.1.adoc
@@ -29,6 +29,9 @@ provisioned Clevis policy. For example:
 * *-t* _SLT_ :
   Test the passphrase for the given slot without unlocking the device
 
+* *-o* _PARAMS_ :
+  Pass arbitrary parameters to cryptsetup; quote parameters as necessary
+
 == SEE ALSO
 
 link:clevis-luks-bind.1.adoc[*clevis-luks-bind*(1)]