.

Jake · Jake · commit 0906d49def5f · 2018-09-20T15:23:00.000+08:00
diff --git a/dataleakage.rst b/dataleakage.rst
@@ -1,6 +1,8 @@
 Data Leakage
 ============
 
+Data leakage is a serious bane in machine learning, which usually results in overly optimistic model results.
+
 Examples
 --------
 Some subtle examples of data leakages.
