flag: describe valid input for Duration flags.

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/5639046

diff --git a/src/pkg/flag/flag.go b/src/pkg/flag/flag.go
index 1719af89a1237dfb78338aeb0b433debb74152e6..c28d0e7207428b23060575193ebe4b0b6fb5082f 100644 (file)
--- a/src/pkg/flag/flag.go
+++ b/src/pkg/flag/flag.go
@@ -49,6 +49,7 @@
 
        Integer flags accept 1234, 0664, 0x1234 and may be negative.
        Boolean flags may be 1, 0, t, f, true, false, TRUE, FALSE, True, False.
+       Duration flags accept any input valid for time.ParseDuration.
 
        The default set of command-line flags is controlled by
        top-level functions.  The FlagSet type allows one to define