diff --git a/share/man/man9/casuword.9 b/share/man/man9/casuword.9
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@@ -1,95 +1,113 @@
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 .Dd October 21, 2014
 .Dt CASU 9
 .Os
 .Sh NAME
 .Nm casueword ,
 .Nm casueword32 ,
 .Nm casuword ,
 .Nm casuword32
 .Nd fetch, compare and store data from user-space
 .Sh SYNOPSIS
 .In sys/types.h
 .In sys/systm.h
 .Ft int
-.Fn casueword "volatile u_long *base" "u_long oldval" "u_long *oldvalp" "u_long newval"
+.Fo casueword
+.Fa "volatile u_long *base"
+.Fa "u_long oldval"
+.Fa "u_long *oldvalp"
+.Fa "u_long newval"
+.Fc
 .Ft int
-.Fn casueword32 "volatile uint32_t *base" "uint32_t oldval" "uint32_t *oldvalp" "uint32_t newval"
+.Fo casueword32
+.Fa "volatile uint32_t *base"
+.Fa "uint32_t oldval"
+.Fa "uint32_t *oldvalp"
+.Fa "uint32_t newval"
+.Fc
 .Ft u_long
-.Fn casuword "volatile u_long *base" "u_long oldval" "u_long newval"
+.Fo casuword
+.Fa "volatile u_long *base"
+.Fa "u_long oldval"
+.Fa "u_long newval"
+.Fc
 .Ft uint32_t
-.Fn casuword32 "volatile uint32_t *base" "uint32_t oldval" "uint32_t newval"
+.Fo casuword32
+.Fa "volatile uint32_t *base"
+.Fa "uint32_t oldval"
+.Fa "uint32_t newval"
+.Fc
 .Sh DESCRIPTION
 The
 .Nm
 functions are designed to perform atomic compare-and-swap operation on
 the value in the usermode memory of the current process.
 .Pp
 The
 .Nm
 routines reads the value from user memory with address
 .Pa base ,
 and compare the value read with
 .Pa oldval .
 If the values are equal,
 .Pa newval
 is written to the
 .Pa *base .
 In case of
 .Fn casueword32
 and
 .Fn casueword ,
 old value is stored into the (kernel-mode) variable pointed by
 .Pa *oldvalp .
 The userspace value must be naturally aligned.
 .Pp
 The callers of
 .Fn casuword
 and
 .Fn casuword32
 functions cannot distinguish between -1 read from
 userspace and function failure.
 .Sh RETURN VALUES
 The
 .Fn casuword
 and
 .Fn casuword32
 functions return the data fetched or -1 on failure.
 The
 .Fn casueword
 and
 .Fn casueword32
 functions return 0 on success and -1 on failure.
 .Sh SEE ALSO
 .Xr atomic 9 ,
 .Xr fetch 9 ,
 .Xr store 9