diff --git a/docs/scheduler/filter.md b/docs/scheduler/filter.md
index adafe56296..7dde792602 100644
--- a/docs/scheduler/filter.md
+++ b/docs/scheduler/filter.md
@@ -154,7 +154,7 @@ You can schedule a container to run only on nodes where a specific image is alre
 
 
 Only `node-1` and `node-3` have the `redis` image. Specify a `-e
-affinity:image=redis` filter to schedule several additional containers to run on
+affinity:image==redis` filter to schedule several additional containers to run on
 these nodes.
 
 
diff --git a/scheduler/filter/README.md b/scheduler/filter/README.md
index 2f925ab235..1eca5bf747 100644
--- a/scheduler/filter/README.md
+++ b/scheduler/filter/README.md
@@ -154,7 +154,7 @@ $ docker -H node-3:2375 pull redis
 ```
 
 Only `node-1` and `node-3` have the `redis` image. Specify a `-e
-affinity:image=redis` filter to schedule several additional containers to run on
+affinity:image==redis` filter to schedule several additional containers to run on
 these nodes.
 
 ```bash