diff --git a/doc/cmd.html b/doc/cmd.html
index 4d6ac01dc4..214b19e181 100644
--- a/doc/cmd.html
+++ b/doc/cmd.html
@@ -22,6 +22,8 @@ using the go <code>tool</code> subcommand, such as <code>go tool vet</code>.
 This style of invocation allows, for instance, checking a single source file
 rather than an entire package: <code>go tool vet myprogram.go</code> as
 compared to <code>go vet mypackage</code>.
+Some of the commands, such as <code>pprof</code>, are accessible only through
+the go <code>tool</code> subcommand.
 </p>
 
 <p>