diff --git a/serversession.go b/serversession.go
index ff3332ed..ccec7bf3 100644
--- a/serversession.go
+++ b/serversession.go
@@ -39,7 +39,7 @@ func setupGetTrackIDPathQuery(
 		// URL doesn't contain trackID - it's track zero
 		if i < 0 {
 			if !strings.HasSuffix(pathAndQuery, "/") {
-				return 0, "", "", fmt.Errorf("path must end with a slash (%v)", pathAndQuery)
+				return 0, "", "", fmt.Errorf("path of a SETUP request must end with a slash (%v)", pathAndQuery)
 			}
 			pathAndQuery = pathAndQuery[:len(pathAndQuery)-1]