diff --git a/src/cluster.c b/src/cluster.c
index 50c79f4f6a5249a6ecc81905197a6834061e61b4..a2fab323a55c066239bc18900dc4b23d30cbcf46 100644
--- a/src/cluster.c
+++ b/src/cluster.c
@@ -1741,7 +1741,9 @@ int clusterProcessPacket(clusterLink *link) {
         if (totlen != explen) return 1;
     }
 
-    /* Check if the sender is a known node. */
+    /* Check if the sender is a known node. Note that for incoming connections
+     * we don't store link->node information, but resolve the node by the
+     * ID in the header each time in the current implementation. */
     sender = clusterLookupNode(hdr->sender);
 
     /* Update the last time we saw any data from this node. We