diff --git a/doc/man/timew.1.in b/doc/man/timew.1.in
index 7d57947d..92a96da4 100644
--- a/doc/man/timew.1.in
+++ b/doc/man/timew.1.in
@@ -127,6 +127,26 @@ Exports all the tracked time in JSON format. Supports filtering. For example:
 Displays the directory containing the extension programs and a table showing
 each extention and its status. See also 'diagnostics'.
 
+.TP
+.B timew fill @<id> [@<id> ...]
+
+The 'fill' command is used to adjust any interval to fill in surrounding gaps.
+Using the 'summary' command, and specifying the ':ids' hint shows interval IDs.
+Using the right ID, you can identify an interval to fill. For example, show
+the IDs:
+
+  $ timew summary :week :ids
+
+Then having selected '@2' as the interval you wish to fill:
+
+  $ timew fill @2
+
+Note that you can fill multiple intervals:
+
+  $ timew fill @2 @10 @23
+
+See also 'hints'.
+
 .TP
 .B timew gaps [<interval>] [<tag> ...]
 Displays a summary of time that is neither tracked nor excluded from tracking.