diff --git a/skimage/filter/rank/_core16.pyx b/skimage/filter/rank/_core16.pyx
index 81fab0b4..4829792b 100644
--- a/skimage/filter/rank/_core16.pyx
+++ b/skimage/filter/rank/_core16.pyx
@@ -1,10 +1,3 @@
-""" to compile this use:
->>> python setup.py build_ext --inplace
-
-to generate html report use:
->>> cython -a core16.pxd
-"""
-
 #cython: cdivision=True
 #cython: boundscheck=False
 #cython: nonecheck=False
diff --git a/skimage/filter/rank/_core8.pyx b/skimage/filter/rank/_core8.pyx
index 7851388d..9955a1e1 100644
--- a/skimage/filter/rank/_core8.pyx
+++ b/skimage/filter/rank/_core8.pyx
@@ -1,10 +1,3 @@
-""" to compile this use:
->>> python setup.py build_ext --inplace
-
-to generate html report use:
->>> cython -a core8.pxd
-"""
-
 #cython: cdivision=True
 #cython: boundscheck=False
 #cython: nonecheck=False
diff --git a/skimage/filter/rank/_crank16.pyx b/skimage/filter/rank/_crank16.pyx
index 57d41563..f6ad10e4 100644
--- a/skimage/filter/rank/_crank16.pyx
+++ b/skimage/filter/rank/_crank16.pyx
@@ -1,11 +1,3 @@
-""" to compile this use:
->>> python setup.py build_ext --inplace
-
-to generate html report use:
->>> cython -a crank16.pxd
-
-"""
-
 #cython: cdivision=True
 #cython: boundscheck=False
 #cython: nonecheck=False
diff --git a/skimage/filter/rank/_crank16_bilateral.pyx b/skimage/filter/rank/_crank16_bilateral.pyx
index d6fb9c71..c013b779 100644
--- a/skimage/filter/rank/_crank16_bilateral.pyx
+++ b/skimage/filter/rank/_crank16_bilateral.pyx
@@ -1,11 +1,3 @@
-""" to compile this use:
->>> python setup.py build_ext --inplace
-
-to generate html report use:
->>> cython -a crank16.pxd
-
-"""
-
 #cython: cdivision=True
 #cython: boundscheck=False
 #cython: nonecheck=False
diff --git a/skimage/filter/rank/_crank8.pyx b/skimage/filter/rank/_crank8.pyx
index be00bf86..da716bd9 100644
--- a/skimage/filter/rank/_crank8.pyx
+++ b/skimage/filter/rank/_crank8.pyx
@@ -1,11 +1,3 @@
-""" to compile this use:
->>> python setup.py build_ext --inplace
-
-to generate html report use:
->>> cython -a crank.pxd
-
-"""
-
 #cython: cdivision=True
 #cython: boundscheck=False
 #cython: nonecheck=False