diff --git a/skimage/feature/texture.py b/skimage/feature/texture.py
index 7e23f0be..beb66ff9 100644
--- a/skimage/feature/texture.py
+++ b/skimage/feature/texture.py
@@ -259,7 +259,7 @@ def local_binary_pattern(image, P, R, method='default'):
             finer quantization of the angular space which is gray scale and
             rotation invariant.
         * 'nri_uniform': non rotation-invariant uniform patterns variant
-            which is only gray scale invariant [2].
+            which is only gray scale invariant [2]_.
         * 'var': rotation invariant variance measures of the contrast of local
             image texture which is rotation but not gray scale invariant.
 
diff --git a/skimage/morphology/grey.py b/skimage/morphology/grey.py
index 0642a104..fdc8381c 100644
--- a/skimage/morphology/grey.py
+++ b/skimage/morphology/grey.py
@@ -53,7 +53,7 @@ def _invert_selem(selem):
     """Change the order of the values in `selem`.
 
     This is a patch for the *weird* footprint inversion in
-    `nd.grey_morphology` [1].
+    `nd.grey_morphology` [1]_.
 
     Parameters
     ----------