exec: add a little package commentary explaining its
relationship to os.Process.
R=golang-dev, rsc1
CC=golang-dev
https://golang.org/cl/4384041
diff --git a/src/pkg/exec/exec.go b/src/pkg/exec/exec.go
index 75ce099..5398eb8 100644
--- a/src/pkg/exec/exec.go
+++ b/src/pkg/exec/exec.go
@@ -2,9 +2,13 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
-// The exec package runs external commands.
+// The exec package runs external commands. It wraps os.StartProcess
+// to make it easier to remap stdin and stdout, connect I/O with pipes,
+// and do other adjustments.
package exec
+// BUG(r): This package should be made even easier to use or merged into os.
+
import (
"os"
"strconv"
