diff --git a/pywb/cdx/cdxobject.py b/pywb/cdx/cdxobject.py
index 6b7dfdfe..837059df 100644
--- a/pywb/cdx/cdxobject.py
+++ b/pywb/cdx/cdxobject.py
@@ -25,6 +25,9 @@ class CaptureNotFoundException(CDXException):
 
 #=================================================================
 class CDXObject(OrderedDict):
+    """
+    dictionary object representing parsed CDX line.
+    """
     CDX_FORMATS = [
         # Public CDX Format
         ["urlkey", "timestamp", "original", "mimetype", "statuscode",
@@ -75,12 +78,16 @@ class CDXObject(OrderedDict):
         self.cdxline = None
 
     def is_revisit(self):
+        """return ``True`` if this record is a revisit record."""
         return (self['mimetype'] == 'warc/revisit' or
                 self['filename'] == '-')
 
     def to_text(self, fields=None):
         """
         return plaintext CDX record (includes newline).
+        if ``fields`` is ``None``, output will have all fields
+        in the order they are stored.
+
         :param fields: list of field names to output.
         """
         if fields is None:
@@ -132,6 +139,7 @@ class IDXObject(OrderedDict):
     def to_text(self, fields=None):
         """
         return plaintext IDX record (including newline).
+
         :param fields: list of field names to output (currently ignored)
         """
         return str(self) + '\n'
diff --git a/pywb/cdx/cdxops.py b/pywb/cdx/cdxops.py
index b127635c..3ef07b6a 100644
--- a/pywb/cdx/cdxops.py
+++ b/pywb/cdx/cdxops.py
@@ -88,9 +88,10 @@ def create_merged_cdx_gen(sources, query):
 
 
 #=================================================================
-# convert text cdx stream to CDXObject/IDXObject
 def make_obj_iter(text_iter, query):
-    # already converted
+    """
+    convert text cdx stream to CDXObject/IDXObject.
+    """
     if query.secondary_index_only:
         cls = IDXObject
     else:
@@ -100,16 +101,20 @@ def make_obj_iter(text_iter, query):
 
 
 #=================================================================
-# limit cdx to at most limit
 def cdx_limit(cdx_iter, limit):
+    """
+    limit cdx to at most `limit`.
+    """
 #    for cdx, _ in itertools.izip(cdx_iter, xrange(limit)):
 #        yield cdx
     return (cdx for cdx, _ in itertools.izip(cdx_iter, xrange(limit)))
 
 
 #=================================================================
-# reverse cdx
 def cdx_reverse(cdx_iter, limit):
+    """
+    return cdx records in reverse order.
+    """
     # optimize for single last
     if limit == 1:
         last = None
@@ -129,9 +134,11 @@ def cdx_reverse(cdx_iter, limit):
 
 
 #=================================================================
-# filter cdx by regex if each filter is field:regex form,
-# apply filter to cdx[field]
 def cdx_filter(cdx_iter, filter_strings):
+    """
+    filter CDX by regex if each filter is :samp:`{field}:{regex}` form,
+    apply filter to :samp:`cdx[{field}]`.
+    """
     # Support single strings as well
     if isinstance(filter_strings, str):
         filter_strings = [filter_strings]
@@ -195,8 +202,10 @@ def cdx_filter(cdx_iter, filter_strings):
 
 
 #=================================================================
-# collapse by timestamp and status code
 def cdx_collapse_time_status(cdx_iter, timelen=10):
+    """
+    collapse by timestamp and status code.
+    """
     timelen = int(timelen)
 
     last_token = None
@@ -211,8 +220,10 @@ def cdx_collapse_time_status(cdx_iter, timelen=10):
 
 
 #=================================================================
-# sort CDXCaptureResult by closest to timestamp
 def cdx_sort_closest(closest, cdx_iter, limit=10):
+    """
+    sort CDXCaptureResult by closest to timestamp.
+    """
     closest_cdx = []
 
     closest_sec = timestamp_to_sec(closest)
@@ -242,8 +253,15 @@ def cdx_sort_closest(closest, cdx_iter, limit=10):
 # Fields to append from cdx original to revisit
 ORIG_TUPLE = ['length', 'offset', 'filename']
 
-
 def cdx_resolve_revisits(cdx_iter):
+    """
+    resolve revisits.
+
+    this filter adds three fields to CDX: ``orig.length``, ``orig.offset``,
+    and ``orig.filename``. for revisit records, these fields have corresponding
+    field values in previous non-revisit (original) CDX record.
+    They are all ``"-"`` for non-revisit records.
+    """
     originals = {}
 
     for cdx in cdx_iter:
diff --git a/pywb/cdx/cdxserver.py b/pywb/cdx/cdxserver.py
index 08dc2b56..ee02edbe 100644
--- a/pywb/cdx/cdxserver.py
+++ b/pywb/cdx/cdxserver.py
@@ -39,9 +39,9 @@ class BaseCDXServer(object):
 
     def _check_cdx_iter(self, cdx_iter, query):
         """ Check cdx iter semantics
-        If iter is empty (no matches), check if fuzzy matching
+        If `cdx_iter` is empty (no matches), check if fuzzy matching
         is allowed, and try it -- otherwise,
-        throw CaptureNotFoundException
+        throw :exc:`~pywb.cdx.cdxobject.CaptureNotFoundException`
         """
 
         cdx_iter = self.peek_iter(cdx_iter)
@@ -93,6 +93,19 @@ class CDXServer(BaseCDXServer):
         self._create_cdx_sources(paths, kwargs.get('config'))
 
     def load_cdx_query(self, query):
+        """
+        load CDX for query parameters ``params``.
+        ``key`` (or ``url``) parameter specifies URL to query,
+        ``matchType`` parameter specifies matching method for ``key``
+        (default ``exact``).
+        other parameters are passed down to :func:`cdx_load`.
+        raises :exc:`~pywb.cdx.cdxobject.CaptureNotFoundException`
+        if no captures are found.
+
+        :param query: query parameters
+        :type query: :class:`~pywb.cdx.query.CDXQuery`
+        :rtype: iterator on :class:`~pywb.cdx.cdxobject.CDXObject`
+        """
         url = query.url
         key, end_key = calc_search_range(url=url,
                                          match_type=query.match_type,
@@ -107,7 +120,8 @@ class CDXServer(BaseCDXServer):
 
     def _create_cdx_sources(self, paths, config):
         """
-        build CDXSource instances for each of path in :param paths:.
+        build CDXSource instances for each of path in ``paths``.
+
         :param paths: list of sources or single source.
         each source may be either string or CDXSource instance. value
         of any other types will be silently ignored.
@@ -171,7 +185,8 @@ class CDXServer(BaseCDXServer):
 #=================================================================
 class RemoteCDXServer(BaseCDXServer):
     """
-    A special cdx server that uses a single RemoteCDXSource
+    A special cdx server that uses a single
+    :class:`~pywb.cdx.cdxsource.RemoteCDXSource`.
     It simply proxies the query params to the remote source
     and performs no local processing/filtering
     """
diff --git a/pywb/cdx/cdxsource.py b/pywb/cdx/cdxsource.py
index e0f0467e..ec63c1c8 100644
--- a/pywb/cdx/cdxsource.py
+++ b/pywb/cdx/cdxsource.py
@@ -39,7 +39,7 @@ class RemoteCDXSource(CDXSource):
     """
     Represents a remote cdx server, to which requests will be proxied.
 
-    Only url and match type params are proxied at this time,
+    Only ``url`` and ``match_type`` params are proxied at this time,
     the stream is passed through all other filters locally.
     """
     def __init__(self, filename, cookie=None, remote_processing=False):