diff --git a/api/LargestContentfulPaint.json b/api/LargestContentfulPaint.json
index b1a89f2f893c17..2513c03b104ac6 100644
--- a/api/LargestContentfulPaint.json
+++ b/api/LargestContentfulPaint.json
@@ -144,7 +144,14 @@
           "spec_url": "https://w3c.github.io/paint-timing/#dom-painttimingmixin-painttime",
           "support": {
             "chrome": {
-              "version_added": false
+              "version_added": "134",
+              "flags": [
+                {
+                  "type": "preference",
+                  "name": "enable-experimental-web-platform-features",
+                  "value_to_set": "enabled"
+                }
+              ]
             },
             "chrome_android": "mirror",
             "edge": "mirror",
@@ -175,19 +182,30 @@
           "spec_url": "https://w3c.github.io/paint-timing/#dom-painttimingmixin-presentationtime",
           "support": {
             "chrome": {
-              "version_added": false
+              "version_added": "134",
+              "flags": [
+                {
+                  "type": "preference",
+                  "name": "enable-experimental-web-platform-features",
+                  "value_to_set": "enabled"
+                }
+              ]
             },
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": "140"
+              "version_added": "140",
+              "partial_implementation": true,
+              "notes": "This property is exposed, but always returns `null`."
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": "26.2"
+              "version_added": "26.2",
+              "partial_implementation": true,
+              "notes": "This property is exposed, but always returns `null`."
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
@@ -256,7 +274,7 @@
               "opera": "mirror",
               "opera_android": "mirror",
               "safari": {
-                "version_added": false
+                "version_added": "26.2"
               },
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",