doc: mention that go tools is needed to access some tool

Change-Id: I020cd3d10a441ba4047800fdf4f93433c458398a
Reviewed-on: https://go-review.googlesource.com/43717
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/doc/cmd.html b/doc/cmd.html
index 4d6ac01dc4d83948a0516cced71c8a364103ddde..214b19e18141efb34cec2282d271ae2ea240d6c2 100644 (file)
--- 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>