diff --git a/observe/observe.go b/observe/observe.go
index cefc40601..b4c31f549 100644
--- a/observe/observe.go
+++ b/observe/observe.go
@@ -55,8 +55,11 @@ func GetGAEInfo() (projectID, service, version string) {
 }
 
 // GetServiceInfo returns the GCP Project ID,
-// the service name and version (gae or through
-// GAE_SERVICE/GAE_VERSION env vars)
+// the service name and version (GAE or through
+// GAE_SERVICE/GAE_VERSION env vars). Note
+// that GAE_SERVICE/GAE_VERSION are not standard but
+// your application can pass them in as variables
+// to be included in your trace attributes
 func GetServiceInfo() (projectID, service, version string) {
 	if IsGAE() {
 		return GetGAEInfo()