diff --git a/README.md b/README.md
index 8bd7d1044..59126a715 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,7 @@ Polyfills are provided for:
 - the `ldap_exop_sync` function introduced in PHP 8.3;
 - the `ldap_connect_wallet` function introduced in PHP 8.3;
 - the `stream_context_set_options` function introduced in PHP 8.3;
+- the `str_increment` and `str_decrement` functions introduced in PHP 8.3;
 - the `Date*Exception/Error` classes introduced in PHP 8.3;
 - the `SQLite3Exception` class introduced in PHP 8.3;
 
diff --git a/src/Php83/README.md b/src/Php83/README.md
index 503e753b0..f29877681 100644
--- a/src/Php83/README.md
+++ b/src/Php83/README.md
@@ -9,6 +9,7 @@ This component provides features added to PHP 8.3 core:
 - [`ldap_exop_sync`](https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures)
 - [`ldap_connect_wallet`](https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures)
 - [`stream_context_set_options`](https://wiki.php.net/rfc/deprecate_functions_with_overloaded_signatures)
+- [`str_increment` and `str_decrement`](https://wiki.php.net/rfc/saner-inc-dec-operators)
 - [`Date*Exception/Error classes`](https://wiki.php.net/rfc/datetime-exceptions)
 - [`SQLite3Exception`](https://wiki.php.net/rfc/sqlite3_exceptions)