diff --git a/data/reference/extension/curl/73/constants.json b/data/reference/extension/curl/73/constants.json
index cf75fed..3cbb886 100644
--- a/data/reference/extension/curl/73/constants.json
+++ b/data/reference/extension/curl/73/constants.json
@@ -598,5 +598,16 @@
                 "constraint": "~7.64.0"
             }
         ]
+    },
+    {
+        "name": "CURL_VERSION_ALTSVC",
+        "ext_min": "7.3.6RC1",
+        "php_min": "7.3.6RC1",
+        "dependencies": [
+            {
+                "name": "libcurl",
+                "constraint": "~7.64.1"
+            }
+        ]
     }
 ]