diff --git a/doc/man/timew.1.in b/doc/man/timew.1.in
index 599ab2a2..f23df9df 100644
--- a/doc/man/timew.1.in
+++ b/doc/man/timew.1.in
@@ -80,6 +80,11 @@ Exports all the tracked time in JSON format. See also 'import'.
 Displays the directory containing the extension programs, and a table showing
 each extention and its status. See also 'diagnostics'.
 
+.TP
+.B timew gaps [<interval>] [<tag> ...]
+Displays a summary of time that is neither tracked, nor excluded from tracking.
+See also 'summary'.
+
 .TP
 .B timew help [<command> | hints | interval]
 The help command shows detailed descriptions and examples of commands,