diff --git a/docs/Manpage.md b/docs/Manpage.md
index 048c24edcb..f0c66b6cd4 100644
--- a/docs/Manpage.md
+++ b/docs/Manpage.md
@@ -1221,6 +1221,8 @@ Apply the bottle commit and publish bottles to Bintray or GitHub Releases.
 
 Run Homebrew with a Ruby profiler. For example, `brew prof readall`.
 
+*Note:* Not (yet) working on Apple Silicon.
+
 * `--stackprof`:
   Use `stackprof` instead of `ruby-prof` (the default).
 
diff --git a/manpages/brew.1 b/manpages/brew.1
index e7121f303a..1ed285dd4e 100644
--- a/manpages/brew.1
+++ b/manpages/brew.1
@@ -1710,6 +1710,9 @@ Use the specified \fIURL\fR as the root of the bottle\'s URL instead of Homebrew
 .SS "\fBprof\fR [\fI\-\-stackprof\fR] \fIcommand\fR [\.\.\.]"
 Run Homebrew with a Ruby profiler\. For example, \fBbrew prof readall\fR\.
 .
+.P
+\fINote:\fR Not (yet) working on Apple Silicon\.
+.
 .TP
 \fB\-\-stackprof\fR
 Use \fBstackprof\fR instead of \fBruby\-prof\fR (the default)\.