diff --git a/unix/pterm.1 b/unix/pterm.1
index 9a7fbd8a..64d8a305 100644
--- a/unix/pterm.1
+++ b/unix/pterm.1
@@ -129,7 +129,7 @@ example:
 
 pterm \-xrm 'ScrollbarOnLeft: 1'
 .IP "\fB\-help\fP, \fB\-\-help\fP"
-Display a message summarizing the available options
+Display a message summarizing the available options.
 .SH X RESOURCES
 \fIpterm\fP can be more completely configured by means of X
 resources. All of these resources are of the form \fIpterm.FOO\fP