diff --git a/Library/Homebrew/dev-cmd/prof.rb b/Library/Homebrew/dev-cmd/prof.rb
index 2f4edb2442..0d49f551a5 100644
--- a/Library/Homebrew/dev-cmd/prof.rb
+++ b/Library/Homebrew/dev-cmd/prof.rb
@@ -17,7 +17,7 @@ module Homebrew
       switch "--stackprof",
              description: "Use `stackprof` instead of `ruby-prof` (the default)."
 
-      named_args :command
+      named_args :command, min: 1
     end
   end
 
diff --git a/docs/Manpage.md b/docs/Manpage.md
index e977015f9d..28fe70f689 100644
--- a/docs/Manpage.md
+++ b/docs/Manpage.md
@@ -1207,7 +1207,7 @@ Apply the bottle commit and publish bottles to Bintray or GitHub Releases.
 * `--root-url`:
   Use the specified *`URL`* as the root of the bottle's URL instead of Homebrew's default.
 
-### `prof` [*`--stackprof`*] [*`command`* ...]
+### `prof` [*`--stackprof`*] *`command`* [...]
 
 Run Homebrew with a Ruby profiler. For example, `brew prof readall`.
 
diff --git a/manpages/brew.1 b/manpages/brew.1
index e85c4a9c6c..9c290e7d91 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -1687,7 +1687,7 @@ Upload to the specified Bintray organisation (default: \fBhomebrew\fR)\.
 \fB\-\-root\-url\fR
 Use the specified \fIURL\fR as the root of the bottle\'s URL instead of Homebrew\'s default\.
 .
-.SS "\fBprof\fR [\fI\-\-stackprof\fR] [\fIcommand\fR \.\.\.]"
+.SS "\fBprof\fR [\fI\-\-stackprof\fR] \fIcommand\fR [\.\.\.]"
 Run Homebrew with a Ruby profiler\. For example, \fBbrew prof readall\fR\.
 .
 .TP