[ci skip] Mention php_pdo_mysql_sqlstate.h in the contributing info

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 1ee4df7c1807287bbf147fc78e8e5fbababfd8cc..986b6e21c5f2b2c9d6df527203e46ce9dfea4a9c 100644 (file)
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -146,6 +146,9 @@ locations.
     └─ pdo/
        ├─ pdo_sql_parser.c          # Generated by re2c
        └─ ...
+    └─ pdo_mysql/
+       ├─ php_pdo_mysql_sqlstate.h  # Generated by `ext/pdo_mysql/get_error_codes.php`
+       └─ ...
     └─ phar/
        ├─ phar_path_check.c         # Generated by re2c
        └─ ...