diff --git a/ext-support.md b/ext-support.md
index fa759d30..afdccdf0 100644
--- a/ext-support.md
+++ b/ext-support.md
@@ -8,7 +8,7 @@
 
 |            | Linux                                                               | macOS                                                          | Windows |
 |------------|---------------------------------------------------------------------|----------------------------------------------------------------|---------|
-| apcu       | yes                                                                 | yes                                                            |         |
+| apcu       | yes, untested                                                       | yes, untested                                                  |         |
 | bcmath     | yes                                                                 | yes                                                            |         |
 | bz2        | yes                                                                 | yes                                                            |         |
 | calendar   | yes                                                                 | yes                                                            |         |