flag: document Nflag function

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/4279065

diff --git a/src/pkg/flag/flag.go b/src/pkg/flag/flag.go
index 4e57e0f09924c0a98583bfa2c541b52058f3aa49..14f4d522c6a4ea23c70d12808c03834cc175e830 100644 (file)
--- a/src/pkg/flag/flag.go
+++ b/src/pkg/flag/flag.go
@@ -289,6 +289,7 @@ func failf(format string, a ...interface{}) {
        os.Exit(2)
 }
 
+// NFlag returns the number of flags that have been set.
 func NFlag() int { return len(flags.actual) }
 
 // Arg returns the i'th command-line argument.  Arg(0) is the first remaining argument