diff --git a/docs/Manpage.md b/docs/Manpage.md
index 7556081cc0..f109d95270 100644
--- a/docs/Manpage.md
+++ b/docs/Manpage.md
@@ -1141,9 +1141,10 @@ Perform a substring search of cask tokens and formula names for *`text`*. If
 
 : Search for *`text`* in the given database.
 
-### `setup-ruby`
+### `setup-ruby [command]`
 
-Installs and configures Homebrew's Ruby.
+Installs and configures Homebrew's Ruby. If `command` is passed, it will only
+run Bundler if necessary for that command.
 
 ### `shellenv [bash|csh|fish|pwsh|sh|tcsh|zsh]`
 
diff --git a/manpages/brew.1 b/manpages/brew.1
index 626cd2d6fb..65bc5b78ec 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -719,8 +719,8 @@ Search for \fItext\fP in the given database\.
 .TP
 \fB\-\-ubuntu\fP
 Search for \fItext\fP in the given database\.
-.SS "\fBsetup\-ruby\fP"
-Installs and configures Homebrew\[u2019]s Ruby\.
+.SS "\fBsetup\-ruby \fR[command]\fP"
+Installs and configures Homebrew\[u2019]s Ruby\. If \fBcommand\fP is passed, it will only run Bundler if necessary for that command\.
 .SS "\fBshellenv \fR[bash|csh|fish|pwsh|sh|tcsh|zsh]\fP"
 Print export statements\. When run in a shell, this installation of Homebrew will be added to your \fBPATH\fP, \fBMANPATH\fP, and \fBINFOPATH\fP\&\.
 .P