diff --git a/javascript/builtins/Temporal/PlainDate.json b/javascript/builtins/Temporal/PlainDate.json
index 2a13f985f9fc17..d8741c38e30652 100644
--- a/javascript/builtins/Temporal/PlainDate.json
+++ b/javascript/builtins/Temporal/PlainDate.json
@@ -628,6 +628,7 @@
           },
           "era": {
             "__compat": {
+              "spec_url": "https://tc39.es/proposal-temporal/#sec-get-temporal.plaindate.prototype.era",
               "tags": [
                 "web-features:temporal"
               ],
@@ -679,6 +680,7 @@
           },
           "eraYear": {
             "__compat": {
+              "spec_url": "https://tc39.es/proposal-temporal/#sec-get-temporal.plaindate.prototype.erayear",
               "tags": [
                 "web-features:temporal"
               ],
diff --git a/javascript/builtins/Temporal/PlainDateTime.json b/javascript/builtins/Temporal/PlainDateTime.json
index 50ac49fee0f8c1..9d6ea6161cd98d 100644
--- a/javascript/builtins/Temporal/PlainDateTime.json
+++ b/javascript/builtins/Temporal/PlainDateTime.json
@@ -628,6 +628,7 @@
           },
           "era": {
             "__compat": {
+              "spec_url": "https://tc39.es/proposal-temporal/#sec-get-temporal.plaindatetime.prototype.era",
               "tags": [
                 "web-features:temporal"
               ],
@@ -679,6 +680,7 @@
           },
           "eraYear": {
             "__compat": {
+              "spec_url": "https://tc39.es/proposal-temporal/#sec-get-temporal.plaindatetime.prototype.erayear",
               "tags": [
                 "web-features:temporal"
               ],