diff --git a/features_cpp26.yaml b/features_cpp26.yaml
index a5556fb..c96dc9e 100644
--- a/features_cpp26.yaml
+++ b/features_cpp26.yaml
@@ -1417,6 +1417,7 @@ features:
   - desc: "`std::mdspan::at()`"
     paper: P3383
     lib: true
+    support: [GCC 16]
 
   - desc: "Inspecting `std::exception_ptr`"
     paper: P2927