diff --git a/Gemfile.lock b/Gemfile.lock
index 5e4529468c6..5f045403a87 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -88,7 +88,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.4)
-    rouge (3.20.0)
+    rouge (3.21.0)
     ruby-enum (0.8.0)
       i18n
     ruby2_keywords (0.0.2)
diff --git a/source/_integrations/logbook.markdown b/source/_integrations/logbook.markdown
index 116805371f6..04b02872619 100644
--- a/source/_integrations/logbook.markdown
+++ b/source/_integrations/logbook.markdown
@@ -187,6 +187,13 @@ script:
           domain: light
 ```
 
+
+<div class="note warning">
+
+When calling the `logbook.log` service without a `domain` or `entity_id`, entries will be added with the the `logbook` domain. Ensure that the `logbook` domain is not filtered away if you want these entries to appear in your logbook.
+
+</div>
+
 <div class='note'>
 
 Sensor entities that have been assigned units (i.e., have a `unit_of_measurement` attribute) are assumed to change frequently and those sensors are automatically excluded from the logbook.