diff --git a/serviceinterface/ServiceInterfaceStream.h b/serviceinterface/ServiceInterfaceStream.h
index aecd45c37..375a18759 100644
--- a/serviceinterface/ServiceInterfaceStream.h
+++ b/serviceinterface/ServiceInterfaceStream.h
@@ -5,8 +5,11 @@
 #include <iostream>
 #include <cstdio>
 
-// Unfortunately, there must be a forward declaration of the log front end
-// (MUST be defined in main), to let the system know where to write to.
+/* Unfortunately, there must be a forward declaration of the log front end
+ * (MUST be defined in main), to let the system know where to write to.
+ * The ServiceInterfaceStream instances, which are declared below and
+ * can instantaited somewhere else can be passed to these front ends by passing
+ * their underlying buffers with .rdbuf() */
 namespace sif {
 extern std::ostream debug;
 extern std::ostream info;