diff --git a/api/WritableStream.json b/api/WritableStream.json
index 002f88ea067b9f..13fbcb24a1babd 100644
--- a/api/WritableStream.json
+++ b/api/WritableStream.json
@@ -29,10 +29,12 @@
             "version_added": "44"
           },
           "safari": {
-            "version_added": false
+            "version_added": false,
+            "implementation_url": "https://trac.webkit.org/changeset/266172/webkit"
           },
           "safari_ios": {
-            "version_added": false
+            "version_added": false,
+            "implementation_url": "https://trac.webkit.org/changeset/266172/webkit"
           },
           "samsunginternet_android": {
             "version_added": "7.0"
@@ -77,10 +79,12 @@
               "version_added": "44"
             },
             "safari": {
-              "version_added": false
+              "version_added": false,
+              "implementation_url": "https://trac.webkit.org/changeset/266172/webkit"
             },
             "safari_ios": {
-              "version_added": false
+              "version_added": false,
+              "implementation_url": "https://trac.webkit.org/changeset/266172/webkit"
             },
             "samsunginternet_android": {
               "version_added": "7.0"
@@ -125,10 +129,12 @@
               "version_added": "44"
             },
             "safari": {
-              "version_added": false
+              "version_added": false,
+              "implementation_url": "https://trac.webkit.org/changeset/266172/webkit"
             },
             "safari_ios": {
-              "version_added": false
+              "version_added": false,
+              "implementation_url": "https://trac.webkit.org/changeset/266172/webkit"
             },
             "samsunginternet_android": {
               "version_added": "7.0"
@@ -173,10 +179,12 @@
               "version_added": "44"
             },
             "safari": {
-              "version_added": false
+              "version_added": false,
+              "implementation_url": "https://trac.webkit.org/changeset/266172/webkit"
             },
             "safari_ios": {
-              "version_added": false
+              "version_added": false,
+              "implementation_url": "https://trac.webkit.org/changeset/266172/webkit"
             },
             "samsunginternet_android": {
               "version_added": "7.0"
@@ -221,10 +229,12 @@
               "version_added": "44"
             },
             "safari": {
-              "version_added": false
+              "version_added": false,
+              "implementation_url": "https://trac.webkit.org/changeset/266172/webkit"
             },
             "safari_ios": {
-              "version_added": false
+              "version_added": false,
+              "implementation_url": "https://trac.webkit.org/changeset/266172/webkit"
             },
             "samsunginternet_android": {
               "version_added": "7.0"