Note a 3.18 commit in neighbour_test.py.

Change-Id: I80d97bd548c8d6749e48f4e8ff539808a7e1e0ab
diff --git a/net/test/neighbour_test.py b/net/test/neighbour_test.py
index 64518a9..1e7739e 100755
--- a/net/test/neighbour_test.py
+++ b/net/test/neighbour_test.py
@@ -183,6 +183,9 @@
 
       android-3.10:
         e4a6d6b neigh: Better handling of transition to NUD_PROBE state
+
+      android-3.18:
+        2011e72 neigh: Better handling of transition to NUD_PROBE state
     """
 
     router4 = self._RouterAddress(self.netid, 4)