diff --git a/lib/metadata/policies.js b/lib/metadata/policies.js
index 9c7b9e2..40a1b38 100644
--- a/lib/metadata/policies.js
+++ b/lib/metadata/policies.js
@@ -1075,7 +1075,7 @@ var policies = {
     "hiddenImages": {
         "tool": "phantomas",
         "label": "Hidden images",
-        "message": "<p>List of all images that have a display:none property, or one of their parents. These images are loaded by the browser even if they're not visible. You might be able to find a way to lazy-load them, only when they get visible.</p><p>Trackers are an exception, you'd better hide them.</p>",
+        "message": "<p>List of all images that have a display:none property, or one of their parents. These images are loaded by the browser even if they're not visible. You might be able to find a way to lazy-load them, only when they get visible.</p><p>As images displayed in 1x1 pixels tend to be trackers, they are excluded from this rule.</p>",
         "isOkThreshold": 1,
         "isBadThreshold": 12,
         "isAbnormalThreshold": 30,