src/pkg/go/build/doc.go | 1 +

diff --git a/src/pkg/go/build/doc.go b/src/pkg/go/build/doc.go
index 83292f29f82fb423cd15fe1611d2ae4537e1f0b5..f17f76ccc7bb0566bd134966eb2f28713267429b 100644
--- a/src/pkg/go/build/doc.go
+++ b/src/pkg/go/build/doc.go
@@ -99,6 +99,7 @@ //	- the compiler being used, either "gc" or "gccgo"
 //	- "cgo", if ctxt.CgoEnabled is true
 //	- "go1.1", from Go version 1.1 onward
 //	- "go1.2", from Go version 1.2 onward
+//	- "go1.3", from Go version 1.3 onward
 //	- any additional words listed in ctxt.BuildTags
 //
 // If a file's name, after stripping the extension and a possible _test suffix,