diff --git a/action.yml b/action.yml
index 791df50e..d5bdfd2a 100644
--- a/action.yml
+++ b/action.yml
@@ -265,6 +265,11 @@ inputs:
     default: 'false'
     required: false
     description: 'Skip the activation/deactivation of Unity. This assumes Unity is already activated.'
+  linux64FileExtension:
+    default: ''
+    required: false
+    description:
+      'Specify the file extension of the executable when building for StandaloneLinux64. For example, ".x86_64"'
 
 outputs:
   volume: