diff --git a/docs/Manpage.md b/docs/Manpage.md
index 9d9fe0488c..a7c71d5385 100644
--- a/docs/Manpage.md
+++ b/docs/Manpage.md
@@ -3807,6 +3807,10 @@ Database update for `brew which-formula`.
 
 : Specify a maximum number of formulae to download and update.
 
+`--summary-file`
+
+: Output a summary of the changes to a file.
+
 ## CUSTOM EXTERNAL COMMANDS
 
 Homebrew, like `git`(1), supports external commands. These are executable
diff --git a/manpages/brew.1 b/manpages/brew.1
index c3eeaac23a..861ce68f17 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -2437,6 +2437,9 @@ Evaluate all installed taps, rather than just the core tap\.
 .TP
 \fB\-\-max\-downloads\fP
 Specify a maximum number of formulae to download and update\.
+.TP
+\fB\-\-summary\-file\fP
+Output a summary of the changes to a file\.
 .SH "CUSTOM EXTERNAL COMMANDS"
 Homebrew, like \fBgit\fP(1), supports external commands\. These are executable scripts that reside somewhere in the \fB$PATH\fP, named \fBbrew\-\fP\fIcmdname\fP or \fBbrew\-\fP\fIcmdname\fP\fB\&\.rb\fP, which can be invoked like \fBbrew\fP \fIcmdname\fP\&\. This allows you to create your own commands without modifying Homebrew\[u2019]s internals\.
 .P