diff --git a/site/router-topology.md b/site/router-topology.md
index dadc9f1b..ff7a2ac4 100644
--- a/site/router-topology.md
+++ b/site/router-topology.md
@@ -48,5 +48,5 @@ first send it to peer 3:
 
 **See Also**
 
- * [Weave Router Encapsulation](/site/router-topology/router-encapsulation.md)
+ * [Weave Router Sleeve Encapsulation](/site/router-topology/router-encapsulation.md)
  * [How Weave Inteprets Network Topology](/site/router-topology/network-topology.md)
diff --git a/site/router-topology/router-encapsulation.md b/site/router-topology/router-encapsulation.md
index 8c3b466d..57b69d7e 100644
--- a/site/router-topology/router-encapsulation.md
+++ b/site/router-topology/router-encapsulation.md
@@ -1,11 +1,11 @@
 ---
-title: Weave Net Router Encapsulation
+title: Weave Net Router Sleeve Encapsulation
 menu_order: 10
 ---
 
-
-When the Weave Net router forwards packets, the encapsulation looks
-something like this:
+When the Weave Net router forwards packets to peers in `sleeve` mode
+(rather than via the [fast data path](/site/fastdp.md)), the
+encapsulation looks something like this:
 
     +-----------------------------------+
     | Name of sending peer              |