diff --git a/skimage/filter/rank/percentile_rank.pyx b/skimage/filter/rank/percentile_rank.pyx
index f9ac9d40..a432ed72 100644
--- a/skimage/filter/rank/percentile_rank.pyx
+++ b/skimage/filter/rank/percentile_rank.pyx
@@ -278,8 +278,8 @@ def percentile(image, selem, out=None, mask=None, shift_x=False, shift_y=False,
                p0=.0, p1=1.):
     """Return greyscale local percentile of an image.
 
-    percentile is computed on the given structuring element. Returns the value of the p0 lower percentile of the
-    neighborhood value distribution.
+    percentile is computed on the given structuring element. Returns the value
+    of the p0 lower percentile of the neighborhood value distribution.
 
     Parameters
     ----------
@@ -358,8 +358,9 @@ def percentile_threshold(image, selem, out=None, mask=None, shift_x=False,
                          shift_y=False, p0=.0, p1=1.):
     """Return greyscale local threshold of an image.
 
-    threshold is computed on the given structuring element. Returns thresholded image such that pixels
-    having a higher value than the the p0 percentile of the neighborhood value distribution are set to 2^nbit-1
+    threshold is computed on the given structuring element. Returns
+    thresholded image such that pixels having a higher value than the the p0
+    percentile of the neighborhood value distribution are set to 2^nbit-1
     (e.g. 255 for 8bit image).
 
     Parameters