Refresh docs
diff --git a/docs/dyn/youtube_v3.subscriptions.html b/docs/dyn/youtube_v3.subscriptions.html
index 7f5948e..74b2864 100644
--- a/docs/dyn/youtube_v3.subscriptions.html
+++ b/docs/dyn/youtube_v3.subscriptions.html
@@ -120,10 +120,10 @@
       "channelId": "A String", # The ID that YouTube uses to uniquely identify the subscriber's channel.
       "publishedAt": "A String", # The date and time that the subscription was created. The value is specified in ISO 8601 (YYYY-MM-DDThh:mm:ss.sZ) format.
       "thumbnails": { # A map of thumbnail images associated with the subscription. For each object in the map, the key is the name of the thumbnail image, and the value is an object that contains other information about the thumbnail.
-        "a_key": { # The thumbnail image's name.
+        "a_key": { # A thumbnail is an image representing a YouTube resource. # The thumbnail image's name.
           "url": "A String", # The thumbnail image's URL.
-          "width": 42,
-          "height": 42,
+          "width": 42, # (Optional) Width of the thumbnail image.
+          "height": 42, # (Optional) Height of the thumbnail image.
         },
       },
     },
@@ -153,10 +153,10 @@
         "channelId": "A String", # The ID that YouTube uses to uniquely identify the subscriber's channel.
         "publishedAt": "A String", # The date and time that the subscription was created. The value is specified in ISO 8601 (YYYY-MM-DDThh:mm:ss.sZ) format.
         "thumbnails": { # A map of thumbnail images associated with the subscription. For each object in the map, the key is the name of the thumbnail image, and the value is an object that contains other information about the thumbnail.
-          "a_key": { # The thumbnail image's name.
+          "a_key": { # A thumbnail is an image representing a YouTube resource. # The thumbnail image's name.
             "url": "A String", # The thumbnail image's URL.
-            "width": 42,
-            "height": 42,
+            "width": 42, # (Optional) Width of the thumbnail image.
+            "height": 42, # (Optional) Height of the thumbnail image.
           },
         },
       },
@@ -210,10 +210,10 @@
             "channelId": "A String", # The ID that YouTube uses to uniquely identify the subscriber's channel.
             "publishedAt": "A String", # The date and time that the subscription was created. The value is specified in ISO 8601 (YYYY-MM-DDThh:mm:ss.sZ) format.
             "thumbnails": { # A map of thumbnail images associated with the subscription. For each object in the map, the key is the name of the thumbnail image, and the value is an object that contains other information about the thumbnail.
-              "a_key": { # The thumbnail image's name.
+              "a_key": { # A thumbnail is an image representing a YouTube resource. # The thumbnail image's name.
                 "url": "A String", # The thumbnail image's URL.
-                "width": 42,
-                "height": 42,
+                "width": 42, # (Optional) Width of the thumbnail image.
+                "height": 42, # (Optional) Height of the thumbnail image.
               },
             },
           },