diff --git a/css/properties/break-after.json b/css/properties/break-after.json
index 9d14a27cb01c39..12c26e24469215 100644
--- a/css/properties/break-after.json
+++ b/css/properties/break-after.json
@@ -139,7 +139,8 @@
               "edge": "mirror",
               "firefox": {
                 "version_added": false,
-                "impl_url": "https://bugzil.la/775617"
+                "impl_url": "https://bugzil.la/775617",
+                "notes": "The value is recognized, but has no effect. See [bug 1972340](https://bugzil.la/1972340)."
               },
               "firefox_android": "mirror",
               "oculus": "mirror",
@@ -147,7 +148,8 @@
               "opera_android": "mirror",
               "safari": {
                 "version_added": false,
-                "impl_url": "https://webkit.org/b/34155"
+                "impl_url": "https://webkit.org/b/34155",
+                "notes": "The value is recognized, but has no effect. See [bug 294559](https://webkit.org/b/294559)."
               },
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",
diff --git a/css/properties/break-before.json b/css/properties/break-before.json
index 92eee07b75dd7b..e33d0695d7e359 100644
--- a/css/properties/break-before.json
+++ b/css/properties/break-before.json
@@ -139,7 +139,8 @@
               "edge": "mirror",
               "firefox": {
                 "version_added": false,
-                "impl_url": "https://bugzil.la/775617"
+                "impl_url": "https://bugzil.la/775617",
+                "notes": "The value is recognized, but has no effect. See [bug 1972340](https://bugzil.la/1972340)."
               },
               "firefox_android": "mirror",
               "oculus": "mirror",
@@ -147,7 +148,8 @@
               "opera_android": "mirror",
               "safari": {
                 "version_added": false,
-                "impl_url": "https://webkit.org/b/34155"
+                "impl_url": "https://webkit.org/b/34155",
+                "notes": "The value is recognized, but has no effect. See [bug 294559](https://webkit.org/b/294559)."
               },
               "safari_ios": "mirror",
               "samsunginternet_android": "mirror",