diff --git a/pytorch_lightning/trainer/dp_mixin.py b/pytorch_lightning/trainer/dp_mixin.py
index 684ff15c..f46d550d 100644
--- a/pytorch_lightning/trainer/dp_mixin.py
+++ b/pytorch_lightning/trainer/dp_mixin.py
@@ -160,8 +160,8 @@ def sanitize_gpu_ids(gpus):
     for gpu in gpus:
         if gpu not in all_available_gpus:
             message = f"""
-            Non-available gpu index {gpu} specified:
-            Available gpu indices are: {all_available_gpus}
+            You requested GPUs: {gpus}
+            But your machine only has: {all_available_gpus}
             """
             raise MisconfigurationException(message)
     return gpus