diff --git a/README.md b/README.md
index bdb1ff8..c5386fe 100644
--- a/README.md
+++ b/README.md
@@ -141,7 +141,7 @@ install-php-extensions @composer-2.0.2
 | pdo_oci |  |  | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | pdo_odbc | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | pdo_pgsql | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
-| pdo_sqlsrv |  |  | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
+| pdo_sqlsrv[*](#special-requirements-for-pdo_sqlsrv) |  |  | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | pgsql | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | propro | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |  |
 | protobuf | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
@@ -159,7 +159,7 @@ install-php-extensions @composer-2.0.2
 | soap | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | sockets | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | solr | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
-| sqlsrv |  |  | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
+| sqlsrv[*](#special-requirements-for-sqlsrv) |  |  | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | ssh2 | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |  |
 | swoole | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
 | sybase_ct | ✓ | ✓ |  |  |  |  |  |  |
@@ -244,7 +244,9 @@ Some extension has special requirements:
 |---|---|
 | <a name="special-requirements-for-enchant"></a>enchant | &bull; Not available in `7.2-alpine3.12` docker images<br />&bull; Not available in `7.3-alpine3.12` docker images<br />&bull; Not available in `7.4-alpine3.12` 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-pdo_sqlsrv"></a>pdo_sqlsrv | &bull; Not available in `7.0-alpine3.7` docker images<br />&bull; Not available in `7.1-alpine3.7` docker images<br />&bull; Not available in `7.1-alpine3.8` docker images<br />&bull; Not available in `7.2-alpine3.7` docker images<br />&bull; Not available in `7.2-alpine3.8` docker images<br />&bull; Not available in `7.3-alpine3.8` docker images |
 | <a name="special-requirements-for-pthreads"></a>pthreads | Requires images with PHP compiled with thread-safety enabled (`zts`). |
+| <a name="special-requirements-for-sqlsrv"></a>sqlsrv | &bull; Not available in `7.0-alpine3.7` docker images<br />&bull; Not available in `7.1-alpine3.7` docker images<br />&bull; Not available in `7.1-alpine3.8` docker images<br />&bull; Not available in `7.1-alpine3.9` docker images<br />&bull; Not available in `7.1-alpine3.10` docker images<br />&bull; Not available in `7.2-alpine3.7` docker images<br />&bull; Not available in `7.2-alpine3.8` docker images<br />&bull; Not available in `7.3-alpine3.8` docker images |
 | <a name="special-requirements-for-tdlib"></a>tdlib | &bull; Not available in `alpine3.7` docker images<br />&bull; Not available in `jessie` docker images |
 <!-- END OF SPECIAL REQUIREMENTS -->