diff --git a/README.md b/README.md
index 043be01..fcd994b 100644
--- a/README.md
+++ b/README.md
@@ -220,7 +220,7 @@ install-php-extensions @fix_letsencrypt
 | json_post | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
 | ldap | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
 | luasandbox | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; |  |
-| lz4 | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
+| lz4[*](#special-requirements-for-lz4) |  | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
 | lzf | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
 | mailparse | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
 | maxminddb |  |  |  |  | &check; | &check; | &check; | &check; | &check; | &check; |
@@ -388,6 +388,7 @@ Some extensions have special requirements:
 |---|---|
 | <a name="special-requirements-for-ddtrace"></a>ddtrace | &bull; Not available in `alpine3.7` docker images<br />&bull; Not available in `alpine3.8` docker images<br />&bull; Not available in `jessie` docker images |
 | <a name="special-requirements-for-geos"></a>geos | &bull; Not available in `alpine3.7` docker images<br />&bull; Not available in `alpine3.8` docker images<br />&bull; Not available in `alpine3.9` docker images<br />&bull; Not available in `alpine3.10` docker images |
+| <a name="special-requirements-for-lz4"></a>lz4 | Not available in `jessie` docker images |
 | <a name="special-requirements-for-memprof"></a>memprof | &bull; Not available in `alpine3.7` docker images<br />&bull; Not available in `alpine3.8` docker images<br />&bull; Not available in `alpine3.9` docker images<br />&bull; Not available in `alpine3.10` docker images<br />&bull; Not available in `alpine3.11` docker images<br />&bull; Not available in `alpine3.12` docker images<br />&bull; Not available in `alpine3.13` docker images<br />&bull; Not available in `alpine3.14` docker images<br />&bull; Not available in `alpine3.15` docker images |
 | <a name="special-requirements-for-parallel"></a>parallel | Requires images with PHP compiled with thread-safety enabled (`zts`) |
 | <a name="special-requirements-for-parle"></a>parle | Not available in `jessie` docker images |
