diff --git a/pkg/buildinfo/buildinfo.go b/pkg/buildinfo/buildinfo.go
index 2f829749c..4b8a6c6a3 100644
--- a/pkg/buildinfo/buildinfo.go
+++ b/pkg/buildinfo/buildinfo.go
@@ -1,10 +1,14 @@
 package buildinfo
 
+// GitInfo is either the empty string (the default)
+// or is set to the git hash of the most recent commit
+// using the -X linker flag. For example, it's set like:
+// $ go install --ldflags="-X camlistore.org/pkg/buildinfo.GitInfo "`./misc/gitversion` camlistore.org/server/camlistored
 var GitInfo string
 
 func Version() string {
 	if GitInfo != "" {
 		return GitInfo
 	}
-	return "unknown" // TODO: show binary's date?
+	return "unknown"
 }