diff --git a/utils/casadm.8 b/utils/casadm.8
index d7a6f54..54b39e4 100644
--- a/utils/casadm.8
+++ b/utils/casadm.8
@@ -423,7 +423,7 @@ Defines output format for parameter list. It can be either \fBtable\fR (default)
 
 .SH Options that are valid with --set-cache-mode (-Q) are:
 .TP
-.B -c, --cache-mode {wt|wb|wa|pt}
+.B -c, --cache-mode {wt|wb|wa|pt|wo}
 Cache mode to be used with a given cache instance.
 
 Available modes:
diff --git a/utils/opencas.conf.5 b/utils/opencas.conf.5
index 776e3ff..4a993da 100644
--- a/utils/opencas.conf.5
+++ b/utils/opencas.conf.5
@@ -22,7 +22,7 @@ Cache ID <1-16384>
 .br
 Cache device <DEVICE>
 .br
-Cache mode {wt|wb|wa|pt}
+Cache mode {wt|wb|wa|pt|wo}
 .br
 Extra fields (optional) ioclass_file=<file>,cleaning_policy=<alru,nop>,promotion_policy=<always,nhit>
 .RE