diff --git a/skimage/graph/graph_merge.py b/skimage/graph/graph_merge.py
index 0c3d4026..7d13d39b 100644
--- a/skimage/graph/graph_merge.py
+++ b/skimage/graph/graph_merge.py
@@ -84,7 +84,7 @@ def merge_hierarchical(labels, rag, thresh, in_place=True):
     Returns
     -------
     out : ndarray
-        The new labelled array.
+        The new labeled array.
 
     Examples
     --------