diff --git a/src/creader_module.c b/src/creader_module.c
index f5477e0..b9fd617 100644
--- a/src/creader_module.c
+++ b/src/creader_module.c
@@ -8,17 +8,6 @@
 
 
 
-PyDoc_STRVAR(read_doc, "Read clusters from open file.\n\n"
-                      "Parameters\n"
-                      "----------\n"
-                      "n: max number of clusters\n"
-
-                      "Returns\n"
-                      "----------\n"
-                      "Array of clusters read\n\n");
-
-
-
 // Create a custom numpy data type that should reflect
 // our cluster data type. 
 // TODO! Update with the actual cluster data type
@@ -46,7 +35,7 @@ typedef struct {
 // raises python exception if something goes wrong
 // returned object should mean file is open and ready to read
 static int ClusterFileReader_init(ClusterFileReader *self, PyObject *args,
-                                  PyObject *kwds) {
+                                  PyObject * Py_UNUSED(kwds)) {
     self->fp = NULL;
 
     // Parse file name 
@@ -83,7 +72,7 @@ ClusterFileReader_dealloc(ClusterFileReader *self)
 // read method 
 static PyObject *
 ClusterFileReader_read(ClusterFileReader *self, PyObject *args,
-                                  PyObject *kwds)
+                                  PyObject * Py_UNUSED(kwds))
 {
 
     const int ndim = 1;
@@ -132,7 +121,7 @@ static PyMethodDef ClusterFileReader_methods[] = {
     {"read", (PyCFunction) ClusterFileReader_read, METH_VARARGS,
      "Read clusters"
     },
-    {NULL}  /* Sentinel */
+    {NULL, NULL, 0, NULL}        /* Sentinel */
 };
 
 
@@ -155,12 +144,21 @@ static PyTypeObject ClusterFileReaderType = {
 static char module_docstring[] =
     "C functions to read cluster files";
 
-// This is the module itself
+// Methods in the module itself
 static PyMethodDef module_methods[] = {
   {NULL, NULL, 0, NULL}};
 
-static struct PyModuleDef creader_def = {PyModuleDef_HEAD_INIT, "creader",
-                                         module_docstring, -1, module_methods};
+static struct PyModuleDef creader_def = {
+    PyModuleDef_HEAD_INIT, "creader",
+    module_docstring, 
+    -1, 
+    module_methods,
+    NULL, //m_slots
+    NULL, //m_traverse
+    NULL, //m_clear
+    NULL //m_free
+};
+
 
 PyMODINIT_FUNC PyInit_creader(void) {
     PyObject *m;