diff --git a/skimage/feature/__init__.py b/skimage/feature/__init__.py
index bde81e59..4a6518d6 100644
--- a/skimage/feature/__init__.py
+++ b/skimage/feature/__init__.py
@@ -7,9 +7,7 @@ from .corner import (corner_kitchen_rosenfeld, corner_harris,
                      corner_peaks)
 from .corner_cy import corner_moravec
 from .template import match_template
-from ._brief import brief, match_keypoints_brief
-from .util import pairwise_hamming_distance
-from .censure import keypoints_censure
+
 
 __all__ = ['daisy',
            'hog',
@@ -24,8 +22,4 @@ __all__ = ['daisy',
            'corner_subpix',
            'corner_peaks',
            'corner_moravec',
-           'match_template',
-           'brief',
-           'pairwise_hamming_distance',
-           'match_keypoints_brief',
-           'keypoints_censure']
+           'match_template']
diff --git a/skimage/feature/_brief.py b/skimage/feature/_brief.py
index 27a8d085..ecc2ec11 100644
--- a/skimage/feature/_brief.py
+++ b/skimage/feature/_brief.py
@@ -9,7 +9,9 @@ from ._brief_cy import _brief_loop
 
 def brief(image, keypoints, descriptor_size=256, mode='normal', patch_size=49,
           sample_seed=1, variance=2):
-    """Extract BRIEF Descriptor about given keypoints for a given image.
+    """**Experimental function**.
+
+    Extract BRIEF Descriptor about given keypoints for a given image.
 
     Parameters
     ----------
@@ -178,7 +180,9 @@ def brief(image, keypoints, descriptor_size=256, mode='normal', patch_size=49,
 
 def match_keypoints_brief(keypoints1, descriptors1, keypoints2,
                           descriptors2, threshold=0.15):
-    """Match keypoints described using BRIEF descriptors in one image to
+    """**Experimental function**.
+
+    Match keypoints described using BRIEF descriptors in one image to
     those in second image.
 
     Parameters
diff --git a/skimage/feature/censure.py b/skimage/feature/censure.py
index 00be16a8..4bb7fdda 100644
--- a/skimage/feature/censure.py
+++ b/skimage/feature/censure.py
@@ -111,7 +111,8 @@ def _suppress_lines(feature_mask, image, sigma, line_threshold):
 
 def keypoints_censure(image, min_scale=1, max_scale=7, mode='DoB',
                       non_max_threshold=0.15, line_threshold=10):
-    """
+    """**Experimental function**.
+
     Extracts CenSurE keypoints along with the corresponding scale using
     either Difference of Boxes, Octagon or STAR bi-level filter.
 
diff --git a/skimage/feature/tests/test_brief.py b/skimage/feature/tests/_test_brief.py
similarity index 100%
rename from skimage/feature/tests/test_brief.py
rename to skimage/feature/tests/_test_brief.py
diff --git a/skimage/feature/tests/test_censure.py b/skimage/feature/tests/_test_censure.py
similarity index 100%
rename from skimage/feature/tests/test_censure.py
rename to skimage/feature/tests/_test_censure.py
diff --git a/skimage/feature/util.py b/skimage/feature/util.py
index eb3817e8..a5267d44 100644
--- a/skimage/feature/util.py
+++ b/skimage/feature/util.py
@@ -14,7 +14,9 @@ def _mask_border_keypoints(image, keypoints, dist):
 
 
 def pairwise_hamming_distance(array1, array2):
-    """Calculate hamming dissimilarity measure between two sets of
+    """**Experimental function**.
+
+    Calculate hamming dissimilarity measure between two sets of
     vectors.
 
     Parameters