diff --git a/README.md b/README.md
index 7788895..9c6f964 100644
--- a/README.md
+++ b/README.md
@@ -148,9 +148,10 @@ Formats a duration in a pretty readable format, in terms of seconds, minutes, ho
 
 ### Kaggle
 
-###### [mlcrate.kaggle.save_sub(df, filename='sub.csv.gz')](https://github.com/mxbi/mlcrate/blob/4cf3f95f557886d8fdf97e4a5ab0908edaa51332/mlcrate/kaggle.py#L1)
+###### [mlcrate.kaggle.save_sub(df, filename='sub_{}.csv.gz')](https://github.com/mxbi/mlcrate/blob/4cf3f95f557886d8fdf97e4a5ab0908edaa51332/mlcrate/kaggle.py#L1)
 
-Saves the passed dataframe with settings for a kaggle submission (index=False), and auto-enables GZIP compression if a '.gz' extension is passed.
+Saves the passed dataframe with index=False, and enables GZIP compression if a '.gz' extension is passed.
+If '{}' exists in the filename, this is replaced with the current time from mlcrate.time.now()
 
 ```python
 >>> df
@@ -158,7 +159,7 @@ Saves the passed dataframe with settings for a kaggle submission (index=False),
 0   0         0.12
 1   1         0.38
 2   2         0.87
->>> mlc.kaggle.save_sub(df) # Saved as sub.csv.gz with compression
+>>> mlc.kaggle.save_sub(df) # Saved as eg. sub_2017_12_28_16_58_29.csv.gz with compression
 >>> mlc.kaggle.save_sub(df, 'sub_uncompressed.csv')
 ```
 
diff --git a/mlcrate/kaggle.py b/mlcrate/kaggle.py
index 243de47..c0829be 100644
--- a/mlcrate/kaggle.py
+++ b/mlcrate/kaggle.py
@@ -1,10 +1,15 @@
-def save_sub(df, filename='sub.csv.gz'):
+from . import time
+
+def save_sub(df, filename='sub_{}.csv.gz'):
     """Saves the passed dataframe with index=False, and enables GZIP compression if a '.gz' extension is passed.
+    If '{}' exists in the filename, this is replaced with the current time from mlcrate.time.now()
 
     Keyword arguments:
     df -- The pandas DataFrame of the submission
     filename -- The filename to save the submission to. Autodetects '.gz'
     """
+    if '{}' in filename:
+        filename = filename.format(time.now())
     if filename.endswith('.gz'):
         compression = 'gzip'
     else: