diff --git a/man2/ioperm.2 b/man2/ioperm.2
index fa4e27b85..863b4df0a 100644
--- a/man2/ioperm.2
+++ b/man2/ioperm.2
@@ -45,7 +45,7 @@ ioperm \- set port input/output permissions
 .SH DESCRIPTION
 .BR ioperm ()
 sets the port access permission bits for the calling thread for
-\fInum\fP bytes starting from port address \fIfrom\fP to the value
+\fInum\fP bits starting from port address \fIfrom\fP to the value
 \fIturn_on\fP.
 If \fIturn_on\fP is nonzero, the calling thread must be privileged
 .RB ( CAP_SYS_RAWIO ).