diff --git a/pytorch_lightning/callbacks/early_stopping.py b/pytorch_lightning/callbacks/early_stopping.py
index 2af05211..4c30b677 100644
--- a/pytorch_lightning/callbacks/early_stopping.py
+++ b/pytorch_lightning/callbacks/early_stopping.py
@@ -80,8 +80,9 @@ class EarlyStopping(Callback):
         """
         monitor_val = logs.get(self.monitor)
         error_msg = (f'Early stopping conditioned on metric `{self.monitor}`'
-                     f' which is not available. Available metrics are:'
-                     f' `{"`, `".join(list(logs.keys()))}`')
+                     f' which is not available. Either add `{self.monitor}` to the return of '
+                     f' validation_epoch end or modify your EarlyStopping callback to use any of the '
+                     f'following: `{"`, `".join(list(logs.keys()))}`')
 
         if monitor_val is None:
             if self.strict: