diff --git a/lib/roi_data_layer/minibatch.py b/lib/roi_data_layer/minibatch.py
index f4535b022..0fc518609 100644
--- a/lib/roi_data_layer/minibatch.py
+++ b/lib/roi_data_layer/minibatch.py
@@ -107,7 +107,7 @@ def _sample_rois(roidb, fg_rois_per_image, rois_per_image, num_classes):
     bg_rois_per_this_image = rois_per_image - fg_rois_per_this_image
     bg_rois_per_this_image = np.minimum(bg_rois_per_this_image,
                                         bg_inds.size)
-    # Sample foreground regions without replacement
+    # Sample background regions without replacement
     if bg_inds.size > 0:
         bg_inds = npr.choice(
                 bg_inds, size=bg_rois_per_this_image, replace=False)