diff --git a/compose/swarm.md b/compose/swarm.md
index bc637417c7..8584925827 100644
--- a/compose/swarm.md
+++ b/compose/swarm.md
@@ -160,15 +160,15 @@ environment variables, so you can use Compose's `environment` option to set
 them.
 
     # Schedule containers on a specific node
-    labels:
+    environment:
       - "constraint:node==node-1"
 
     # Schedule containers on a node that has the 'storage' label set to 'ssd'
-    labels:
+    environment:
       - "constraint:storage==ssd"
 
     # Schedule containers where the 'redis' image is already pulled
-    labels:
+    environment:
       - "affinity:image==redis"
 
 For the full set of available filters and expressions, see the [Swarm