diff --git a/data/usage/products-usage.vl.json b/data/usage/products-usage.vl.json
index 31eef7a..b5faaf3 100644
--- a/data/usage/products-usage.vl.json
+++ b/data/usage/products-usage.vl.json
@@ -66,7 +66,8 @@
       "field": "site",
       "type": "nominal",
       "legend": {
-        "title": "User"
+        "title": "User",
+        "symbolStrokeWidth": 10
       }
     }
   }
diff --git a/data/usage/user-usage.vl.json b/data/usage/user-usage.vl.json
index eeaa1bd..c13888f 100644
--- a/data/usage/user-usage.vl.json
+++ b/data/usage/user-usage.vl.json
@@ -60,7 +60,8 @@
       "field": "user",
       "type": "nominal",
       "legend": {
-        "title": "User"
+        "title": "User",
+        "symbolStrokeWidth": 10
       }
     }
   }