diff --git a/src/metatrain/experimental/pet/trainer.py b/src/metatrain/experimental/pet/trainer.py
index 24c77629d..32b9bdbeb 100644
--- a/src/metatrain/experimental/pet/trainer.py
+++ b/src/metatrain/experimental/pet/trainer.py
@@ -153,7 +153,7 @@ def train(
 
         st = """
 Legend: LR          -> Learning Rate
-        MAE         -> Mean Square Error
+        MAE         -> Mean Absolute Error
         RMSE        -> Root Mean Square Error
         V-E-MAE/at  -> MAE of the Energy per atom on the Validation set
         V-E-RMSE/at -> RMSE of the Energy per atom on the Validation set