added comment

raghuveerbhat · raghuveerbhat · commit 6a7d1c1e381e · 2022-11-12T20:48:55.000Z
diff --git a/sklearn/covariance/_shrunk_covariance.py b/sklearn/covariance/_shrunk_covariance.py
@@ -24,6 +24,7 @@
 
 
 def _oas(X, *, assume_centered=False):
+    """Estimate covariance with the Oracle Approximating Shrinkage algorithm."""
     # for only one feature, the result is the same whatever the shrinkage
     if len(X.shape) == 2 and X.shape[1] == 1:
         if not assume_centered:
