diff --git a/xarray/core/groupby.py b/xarray/core/groupby.py
index aa28f469b77..866099c1e54 100644
--- a/xarray/core/groupby.py
+++ b/xarray/core/groupby.py
@@ -514,7 +514,7 @@ def _binary_op(self, other, f, reflexive=False):
             # so we align by reindexing and then rename dimensions.
 
             # Broadcast out scalars for backwards compatibility
-            # TODO: get rid of this.
+            # TODO: get rid of this when fixing GH2145
             for var in other.coords:
                 if other[var].ndim == 0:
                     other[var] = (