diff --git a/README.md b/README.md
index 95a0a15..3ab98f7 100644
--- a/README.md
+++ b/README.md
@@ -288,6 +288,7 @@ install-php-extensions @fix_letsencrypt
 | vips[*](#special-requirements-for-vips) |  |  | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | wddx | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |  |  |  |
 | xdebug | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
+| xdiff | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | xhprof | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | xlswriter |  |  | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | xmldiff | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
@@ -301,7 +302,7 @@ install-php-extensions @fix_letsencrypt
 | zookeeper | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | zstd | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 
-*Number of supported extensions: 123*
+*Number of supported extensions: 124*
 <!-- END OF EXTENSIONS TABLE -->
 
 PS: the pre-installed PHP extensions are excluded from this list.