diff --git a/model/ftn/w3partmd.ftn b/model/ftn/w3partmd.ftn
index 6c149c7e7..e3fa05fa3 100644
--- a/model/ftn/w3partmd.ftn
+++ b/model/ftn/w3partmd.ftn
@@ -148,7 +148,7 @@
 !         5) 2-band partitioning; produces hi and low freqency band partitions
 !            using a user-defined cutoff frequency (PTFCUT). [DIMXP = 2]
 !
-!     set DTP = 1 in the MISC namelist to request discrete peak period
+!     set DISCRTP .TRUE. in the MISC namelist to request discrete peak period
 !
 !     (Chris Bunney, UK Met Office, Jul 2018)
 !