diff --git a/ipwb/indexer.py b/ipwb/indexer.py
index 3c78e067..8ee0c65d 100755
--- a/ipwb/indexer.py
+++ b/ipwb/indexer.py
@@ -1,5 +1,14 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
+"""
+InterPlanetary Wayback indexer
+
+This script reads a WARC file and returns a CDXJ representative of its
+ contents. In doing so, it extracts all archived HTTP responses from
+ warc-response records, separates the HTTP header from the body, pushes each
+ into IPFS, and retains the hashes. These hashes are then used to populate the
+ JSON block corresponding to the archived URI.
+"""
 
 from __future__ import print_function
 import sys
diff --git a/ipwb/replay.py b/ipwb/replay.py
index 7599b1e6..7f2bde27 100755
--- a/ipwb/replay.py
+++ b/ipwb/replay.py
@@ -1,5 +1,13 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
+"""
+InterPlanetary Wayback Replay system
+
+This script handles requests to replay IPWB archived contents based on a
+supplied CDXJ file. This file has been previously generated by the ipwb
+indexer. An interface is supplied when first started to assist the user in
+navigating their captures.
+"""
 
 from __future__ import print_function
 import sys
@@ -54,6 +62,9 @@ def setServerHeader(response):
 
 @app.route('/webui/<path:path>')
 def showWebUI(path):
+    """ Handle requests for the IPWB replay Web interface and requests
+        for initializing the replay ServiceWorker.
+    """
     webuiPath = '/'.join(('webui', path)).replace('ipwb.replay', 'ipwb')
     content = pkg_resources.resource_string(__name__, webuiPath)
 
@@ -92,6 +103,9 @@ def showWebUI(path):
 
 
 def getServiceWorker(path):
+    """ Get the ServiceWorker code and return corresponding
+        HTTP response information for the Worker
+    """
     path = ('/' + path).replace('ipwb.replay', 'ipwb')
     content = pkg_resources.resource_string(__name__, path)
     resp = Response(content, mimetype='application/javascript')
@@ -172,6 +186,7 @@ def __init__(self, url_map, *items):
 
 @app.route('/memento/<regex("[0-9]{1,14}"):datetime>/<path:urir>')
 def showMemento(urir, datetime):
+    """ Request a URI-R at a supplied datetime from the CDXJ """
     urir = getCompleteURI(urir)
 
     if ipwbConfig.isLocalHosty(urir):
@@ -195,6 +210,7 @@ def showMemento(urir, datetime):
 
 
 def getCDXJLineClosestTo(datetimeTarget, cdxjLines):
+    """ Get the closest CDXJ entry for a datetime and URI-R """
     smallestDiff = float('inf')  # math.inf is only py3
     bestLine = None
     datetimeTarget = int(datetimeTarget)
@@ -208,6 +224,7 @@ def getCDXJLineClosestTo(datetimeTarget, cdxjLines):
 
 
 def getCDXJLinesWithURIR(urir, indexPath):
+    """ Get all CDXJ records corresponding to a URI-R """
     if not indexPath:
         indexPath = ipwbConfig.getIPWBReplayIndexPath()
     indexPath = getIndexFileFullPath(indexPath)