diff --git a/godoc/vfs/os.go b/godoc/vfs/os.go
index 637d65fdf5..35d050946e 100644
--- a/godoc/vfs/os.go
+++ b/godoc/vfs/os.go
@@ -17,9 +17,9 @@ import (
 // We expose a new variable because otherwise we need to copy the findGOROOT logic again
 // from cmd/godoc which is already copied twice from the standard library.
 
-// GOROOT returns the GOROOT path under which the godoc binary is running.
+// GOROOT is the GOROOT path under which the godoc binary is running.
 // It is needed to check whether a filesystem root is under GOROOT or not.
-// This is set from cmd/godoc/main.go
+// This is set from cmd/godoc/main.go.
 var GOROOT = runtime.GOROOT()
 
 // OS returns an implementation of FileSystem reading from the