diff --git a/README.md b/README.md
index 690273d..c37576f 100644
--- a/README.md
+++ b/README.md
@@ -130,8 +130,9 @@ RUN install-php-extensions gd xdebug
 | xsl | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | yaml | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | zip | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
+| zookeeper | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 
-*Number of supported extensions: 80*
+*Number of supported extensions: 81*
 <!-- END OF EXTENSIONS TABLE -->
 
 PS: the pre-installed PHP extensions are excluded from this list.