diff --git a/README.md b/README.md
index 8d4e9e9..a0008b5 100644
--- a/README.md
+++ b/README.md
@@ -385,10 +385,10 @@ Some extensions have special requirements:
| memprof | Not available in `alpine` docker images |
| parallel | Requires images with PHP compiled with thread-safety enabled (`zts`). |
| parle | Not available in `jessie` docker images |
-| pdo_sqlsrv | • Not available in `alpine3.7` docker images
• Not available in `alpine3.8` docker images |
+| pdo_sqlsrv | • Not available in `alpine3.7` docker images
• Not available in `alpine3.8` docker images
• Not available in ARM architectures. |
| pthreads | Requires images with PHP compiled with thread-safety enabled (`zts`). |
| sodium | Not available in `jessie` docker images |
-| sqlsrv | • Not available in `alpine3.7` docker images
• Not available in `alpine3.8` docker images
• Not available in `7.1-alpine3.9` docker images
• Not available in `7.1-alpine3.10` docker images |
+| sqlsrv | • Not available in `alpine3.7` docker images
• Not available in `alpine3.8` docker images
• Not available in `7.1-alpine3.9` docker images
• Not available in `7.1-alpine3.10` docker images
• Not available in ARM architectures. |
| tensor | Not available in `alpine3.15` docker images |
| vips | • Not available in `alpine3.7` docker images
• Not available in `alpine3.8` docker images
• Not available in `alpine3.9` docker images
• Not available in `jessie` docker images |