diff --git a/features-json/http3.json b/features-json/http3.json
index 82ef88f6cf..e2ed5565a9 100644
--- a/features-json/http3.json
+++ b/features-json/http3.json
@@ -383,23 +383,23 @@
       "15.4":"a d #4 #5",
       "15.5":"a d #4 #5",
       "15.6":"a d #4 #5",
-      "16.0":"a d #5",
-      "16.1":"a d #5",
-      "16.2":"a d #5",
-      "16.3":"a d #5",
-      "16.4":"a #5",
-      "16.5":"a #5",
-      "16.6":"a #5",
-      "17.0":"a #5",
-      "17.1":"a #5",
-      "17.2":"a #5",
-      "17.3":"a #5",
-      "17.4":"a #5",
-      "17.5":"a #5",
-      "17.6":"a #5",
-      "18.0":"a #5",
-      "18.1":"a #5",
-      "TP":"a #5"
+      "16.0":"y d #5",
+      "16.1":"y d #5",
+      "16.2":"y d #5",
+      "16.3":"y d #5",
+      "16.4":"y #5",
+      "16.5":"y #5",
+      "16.6":"y #5",
+      "17.0":"y #5",
+      "17.1":"y #5",
+      "17.2":"y #5",
+      "17.3":"y #5",
+      "17.4":"y #5",
+      "17.5":"y #5",
+      "17.6":"y #5",
+      "18.0":"y",
+      "18.1":"y",
+      "TP":"y"
     },
     "opera":{
       "9":"n",
@@ -540,22 +540,22 @@
       "15.4":"a d #5",
       "15.5":"a d #5",
       "15.6-15.8":"a d #5",
-      "16.0":"a d #5",
-      "16.1":"a d #5",
-      "16.2":"a d #5",
-      "16.3":"a d #5",
-      "16.4":"a #5",
-      "16.5":"a #5",
-      "16.6-16.7":"a #5",
-      "17.0":"a #5",
-      "17.1":"a #5",
-      "17.2":"a #5",
-      "17.3":"a #5",
-      "17.4":"a #5",
-      "17.5":"a #5",
-      "17.6":"a #5",
-      "18.0":"a #5",
-      "18.1":"a #5"
+      "16.0":"y d #5",
+      "16.1":"y d #5",
+      "16.2":"y d #5",
+      "16.3":"y d #5",
+      "16.4":"y #5",
+      "16.5":"y #5",
+      "16.6-16.7":"y #5",
+      "17.0":"y #5",
+      "17.1":"y #5",
+      "17.2":"y #5",
+      "17.3":"y #5",
+      "17.4":"y #5",
+      "17.5":"y #5",
+      "17.6":"y #5",
+      "18.0":"y",
+      "18.1":"y"
     },
     "op_mini":{
       "all":"n"
@@ -639,7 +639,7 @@
     "2":"Can be enabled in Chrome(Chromium) via the `--enable-quic` & `--quic-version=h3-23` command line arguments.",
     "3":"Can be enabled in Chrome(Chromium) via the `--enable-quic` & `--quic-version=h3-29` command line arguments.",
     "4":"Requires macOS 11 Big Sur or later.",
-    "5":"Enabled by default for a portion of users."
+    "5":"Since Sept 2024, HTTP3 is enabled for all users of Safari 16 and newer. Before then, it was enabled for a subset of users. Enabling the feature flag ensured support."
   },
   "usage_perc_y":77,
   "usage_perc_a":17.53,