diff --git a/core/context.py b/core/context.py
index 908cd69..d2de27b 100644
--- a/core/context.py
+++ b/core/context.py
@@ -1,5 +1,13 @@
 from django.conf import settings
 from troggle.core.models.troggle import Expedition
 
+'''This is the only troglle-specific 'context processor' that troggle uses
+in the processing of Django templates
+
+This seems to mean that every page produced has bundled in its context the complete 'settings' and 
+the  expedition class object, so all templates can doe queries on Expedition.
+https://betterprogramming.pub/django-quick-tips-context-processors-da74f887f1fc
+'''
+
 def troggle_context(request):
     return { 'settings':settings, 'Expedition':Expedition }
\ No newline at end of file
diff --git a/core/forms.py b/core/forms.py
index 73d541a..f435e4c 100644
--- a/core/forms.py
+++ b/core/forms.py
@@ -11,6 +11,10 @@ from django.contrib.admin.widgets import AdminDateWidget
 from troggle.core.models.troggle import Person, PersonExpedition, Expedition
 from troggle.core.models.caves import Cave, LogbookEntry, QM, Entrance, CaveAndEntrance
 
+'''These are all the Forms used by troggle
+Some are not used and need renovating or destroying.
+'''
+
 class CaveForm(ModelForm):
     underground_description = forms.CharField(required = False, widget=forms.Textarea())
     explorers = forms.CharField(required = False, widget=forms.Textarea())
diff --git a/core/middleware.py b/core/middleware.py
index 56078a9..91e64ec 100644
--- a/core/middleware.py
+++ b/core/middleware.py
@@ -2,6 +2,7 @@ from django.conf import settings
 from django import http
 from django.urls import reverse, resolve,Resolver404
 """Non-standard django middleware is loaded from this file.
+It needs re-writing to be compatible with Django v2.0+
 """
 
 class SmartAppendSlashMiddleware(object):
diff --git a/core/unused.py b/core/unused.py
index c4e9ba3..76f55f4 100644
--- a/core/unused.py
+++ b/core/unused.py
@@ -5,8 +5,8 @@ import logging
 from django.conf import settings
 from django.shortcuts import render
 
-"""Oddball mixture of critical, superfluous and useful functions which should 
-be re-located more sensibly to other modules:
+"""Oddball mixture of apparently now superfluous functions which should 
+be deleted
 
 
 various HTML/wiki functions presumably for logbooks?
diff --git a/core/views/caves.py b/core/views/caves.py
index 8884d46..b4c2932 100644
--- a/core/views/caves.py
+++ b/core/views/caves.py
@@ -15,13 +15,18 @@ from django.shortcuts import get_object_or_404, render
 from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned
 
 import troggle.settings as settings
-#import troggle.core.models as models
 from troggle.core.views import expo
 from troggle.core.models.troggle import Expedition, DataIssue
 from troggle.core.models.caves import CaveSlug, Cave, CaveAndEntrance, QM, EntranceSlug, Entrance, Area, SurvexStation, GetCaveLookup
 from troggle.core.forms import CaveForm, CaveAndEntranceFormSet, VersionControlCommentForm, EntranceForm, EntranceLetterForm
 from .login import login_required_if_public
 
+'''Manages the complex procedures to assemble a cave description out of the compnoents
+Manages the use of cavern to parse survex files to produce 3d and pos files
+
+Also generates the prospecting guide document.
+'''
+
 class MapLocations(object):
     p = [
         ("laser.0_7", "BNase", "Reference", "Bräuning Nase laser point"),
diff --git a/core/views/statistics.py b/core/views/statistics.py
index fc62754..c317d43 100644
--- a/core/views/statistics.py
+++ b/core/views/statistics.py
@@ -17,6 +17,9 @@ from troggle.core.models.survex import SurvexBlock
 
 import troggle.settings as settings
 
+'''Very simple report pages summarizing data about the whole set of expeditions and of
+the status of data inconsistencies
+'''
 
 def pathsreport(request):
     pathsdict = OrderedDict()
diff --git a/core/views/survex.py b/core/views/survex.py
index 2bcf79f..350c404 100644
--- a/core/views/survex.py
+++ b/core/views/survex.py
@@ -19,6 +19,10 @@ from troggle.core.models.survex import SurvexBlock, SurvexPersonRole, SurvexFile
 from troggle.core.models.caves import Cave, PersonTrip, LogbookEntry
 from troggle.parsers.people import GetPersonExpeditionNameLookup
 
+'''Everything that views survexfiles 
+but also displays data on a cave or caves when there is ambiguity
+'''
+
 survexdatasetpath = Path(settings.SURVEX_DATA)
 
 survextemplatefile = """; *** THIS IS A TEMPLATE FILE NOT WHAT YOU MIGHT BE EXPECTING ***
diff --git a/deprecations.txt b/deprecations.txt
index 06c148a..e69de29 100644
--- a/deprecations.txt
+++ b/deprecations.txt
@@ -1,6 +0,0 @@
-/mnt/d/CUCC-Expo/t37/lib/python3.7/site-packages/django/db/models/sql/query.py:11: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
-  from collections import Counter, Iterator, Mapping, OrderedDict
-/mnt/d/CUCC-Expo/t37/lib/python3.7/site-packages/django/db/models/sql/query.py:11: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
-  from collections import Counter, Iterator, Mapping, OrderedDict
-/mnt/d/CUCC-Expo/t37/lib/python3.7/site-packages/django/core/paginator.py:126: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3,and in 3.9 it will stop working
-  class Page(collections.Sequence):
diff --git a/localsettingsWSL.py b/localsettingsWSL.py
index 7262ca0..76dc3aa 100644
--- a/localsettingsWSL.py
+++ b/localsettingsWSL.py
@@ -74,6 +74,7 @@ JSLIB_URL  = urllib.parse.urljoin(URL_ROOT , '/javascript/') # used for CaveView
 
 PUBLIC_SITE = True
 DEBUG = True # Always keep this True, even when on public server. Otherwise NO USEFUL ERROR MESSAGES !
+CACHEDPAGES = True  # experimental page cache for a handful of page types
 
 # executables:
 CAVERN = 'cavern' # for parsing .svx files and producing .3d files
@@ -171,4 +172,3 @@ JSLIB_ROOT      = os.fspath(JSLIB_ROOT)
 JSLIB_ROOT      = os.fspath(JSLIB_ROOT)
 JSLIB_ROOT      = os.fspath(JSLIB_ROOT)
 SURVEY_SCANS    = os.fspath(SURVEY_SCANS)
-print(" + finished importing troggle/localsettings.py")
diff --git a/parsers/QMs.py b/parsers/QMs.py
index 3a3e2bb..fe796a0 100644
--- a/parsers/QMs.py
+++ b/parsers/QMs.py
@@ -9,6 +9,7 @@ from troggle.core.models.troggle import DataIssue
 from troggle.core.models.caves import QM, Cave, LogbookEntry
 from troggle.core.utils import save_carefully
 
+'''Reads the CSV files containg QMs for a select few caves'''
 
 def deleteQMs():
     QM.objects.all().delete()
diff --git a/parsers/imports.py b/parsers/imports.py
index 5309065..bfafbfe 100644
--- a/parsers/imports.py
+++ b/parsers/imports.py
@@ -15,6 +15,9 @@ import troggle.parsers.surveys
 import troggle.parsers.logbooks
 import troggle.parsers.QMs
 
+'''Master data importUsed only by databaseReset.py currently
+'''
+
 def import_caves():
     print("-- Importing Caves to ",end="")
     print(django.db.connections.databases['default']['NAME'])
diff --git a/parsers/logbooks.py b/parsers/logbooks.py
index c24af07..51171d0 100644
--- a/parsers/logbooks.py
+++ b/parsers/logbooks.py
@@ -15,10 +15,12 @@ from troggle.core.utils import TROG, save_carefully
 from troggle.core.models.caves import Cave, LogbookEntry, PersonTrip, GetCaveLookup
 from parsers.people import GetPersonExpeditionNameLookup
 
-# 
+'''
+Parses and imports logbooks in all their wonderful confusion
+
 # When we edit logbook entries, allow a "?" after any piece of data to say we've frigged it and
 # it can be checked up later from the hard-copy if necessary; or it's not possible to determin (name, trip place, etc)
-#
+'''
 
 #
 # the logbook loading section
diff --git a/parsers/survex.py b/parsers/survex.py
index 9d23cc8..ad6f27f 100644
--- a/parsers/survex.py
+++ b/parsers/survex.py
@@ -20,6 +20,10 @@ from troggle.core.views.caves import MapLocations
 from troggle.core.models.troggle import DataIssue, Expedition
 from troggle.core.models.survex import SurvexPersonRole, ScansFolder, SurvexDirectory, SurvexFile, SurvexBlock, SurvexStation
 
+'''Imports the tree of survex files following form a defined root .svx file
+It does also NOT scan the Loser repo for all the svx files - though it should !
+'''
+
 survexblockroot = None
 ROOTBLOCK = "rootblock"
 METRESINFEET = 3.28084
diff --git a/parsers/surveys.py b/parsers/surveys.py
index 66a3299..bba5d3f 100644
--- a/parsers/surveys.py
+++ b/parsers/surveys.py
@@ -15,6 +15,10 @@ from troggle.core.models.survex import SingleScan, ScansFolder, TunnelFile
 from troggle.core.models.troggle import DataIssue
 from troggle.core.utils import save_carefully
 
+'''Scans through all the :drawings: repository looking
+for tunnel and therion files
+'''
+
 
 def get_or_create_placeholder(year):
     """ All surveys must be related to a logbookentry. We don't have a way to
diff --git a/requirements.txt b/requirements.txt
index 5470f61..a7a7711 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,8 @@
 confusable-homoglyphs==3.2.0
 Django==2.2.19
-docutils==0.17
+docutils==0.14
 gunicorn==20.1.0
-Pillow==8.2.0
-pytz==2021.1
-sqlparse==0.4.1
-Unidecode==1.2.0
+Pillow==5.4.1
+pytz==2019.1
+sqlparse==0.2.4
+Unidecode==1.0.23