diff --git a/skimage/filter/rank/_percentile.py b/skimage/filter/rank/_percentile.py
index 7f24e3e0..f2b5e7f4 100644
--- a/skimage/filter/rank/_percentile.py
+++ b/skimage/filter/rank/_percentile.py
@@ -315,7 +315,7 @@ def sum_percentile(image, selem, out=None, mask=None, shift_x=False,
     """Return greyscale local sum of an image.
 
     sum is computed on the given structuring element. Only levels between
-    percentiles [p0, p1] are used. result is truncated (8bit or 16bit).
+    percentiles [p0, p1] are used. Result is truncated (8bit or 16bit).
 
     Parameters
     ----------
diff --git a/skimage/filter/rank/bilateral.py b/skimage/filter/rank/bilateral.py
index f6e7d228..6abba0ec 100644
--- a/skimage/filter/rank/bilateral.py
+++ b/skimage/filter/rank/bilateral.py
@@ -169,7 +169,8 @@ def sum_bilateral(image, selem, out=None, mask=None, shift_x=False,
     Radiometric similarity is defined by the greylevel interval [g-s0, g+s1]
     where g is the current pixel greylevel. Only pixels belonging to the
     structuring element AND having a greylevel inside this interval are
-    averaged. Return greyscale local bilateral_sum of an image.
+    summed. Return greyscale local bilateral_sum of an image.
+    Result is truncated (8bit or 16bit).
 
     Parameters
     ----------