From 3834d248de669eb23a43ed19ed0f5db6078fccce Mon Sep 17 00:00:00 2001
From: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
Date: Fri, 11 May 2007 22:33:51 +0200
Subject: [PATCH] add a small comment

---
 src/core/uid-manager.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/core/uid-manager.h b/src/core/uid-manager.h
index 5cc6c1adc..e4648e31a 100644
--- a/src/core/uid-manager.h
+++ b/src/core/uid-manager.h
@@ -27,6 +27,9 @@
 
 namespace ns3 {
 
+/**
+ * zero is never a valid uid value.
+ */
 class UidManager
 {
 public: