diff --git a/NEWS b/NEWS
index 956f93fdbc5..68402303800 100644
--- a/NEWS
+++ b/NEWS
@@ -53,6 +53,9 @@ PHP                                                                        NEWS
     as per RFC: https://wiki.php.net/rfc/permanent_hash_ext. (Kalle)
   . Implemented FR #71890 (crc32c checksum algorithm). (Andrew Brampton)
 
+- Intl:
+  . Unbundled the InterBase extension and moved it to PECL. (Kalle)
+
 - Intl:
   . Raised requirements to ICU ≥ 50.1. (cmb)
   . Changed default of $variant parameter of idn_to_ascii() and idn_to_utf8().
diff --git a/UPGRADING b/UPGRADING
index 0aee80cdbb7..ba0d5b4ed5a 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -274,6 +274,12 @@ PHP 7.4 UPGRADE NOTES
 8. Removed Extensions and SAPIs
 ========================================
 
+- Interbase:
+  . The interbase extension has been moved to PECL. Access to an InterBase 
+    and/or FireBird based database is still available with the PDO_Firebird 
+    extension. For more details see the RFC:
+    https://wiki.php.net/rfc/deprecate-and-remove-ext-interbase
+
 ========================================
 9. Other Changes to Extensions
 ========================================