diff --git a/BUGs b/BUGs
index 4a651a1..a317411 100644
--- a/BUGs
+++ b/BUGs
@@ -3,6 +3,8 @@
 ### DB/back-end
 BUG-2:		series does not deal with calcd_rating... 
 			- (on edit could, recalc as a catch-all, and obviously if we change a single book's rating, we should re-calc)
+			OK: have a once-off reset calc values (have an admin route for it, why not - leverage the Calc func in series.py)
+			THEN: any POST to /book/<id> with a series, then re-calc (with Calc func) for just this series
 
 ### UI not updating after DB change:
 BUG-3:		alter a condition, covertype, etc. and its not in drop-down list (even though db look via index is correct, e.g books.html shows updated covertype)
diff --git a/main.py b/main.py
index 76b563a..eeb00a1 100644
--- a/main.py
+++ b/main.py
@@ -38,7 +38,7 @@ from covertype import Covertype, CovertypeForm, CovertypeSchema, GetCovertypeByI
 from owned import Owned, OwnedForm, OwnedSchema, GetOwnedById
 from rating import Rating, RatingForm, RatingSchema, GetRatingById
 from loan import Loan, LoanForm, LoanSchema
-from series import Series, SeriesForm, SeriesSchema, ListOfSeriesWithMissingBooks
+from series import Series, SeriesForm, SeriesSchema, ListOfSeriesWithMissingBooks, CalcAvgRating
 
 ####################################### CLASSES / DB model #######################################
 class QuickParentBook:
@@ -515,6 +515,7 @@ def book(id):
                     return redirect( '/book/{}'.format(pid) )
                 else:
                     return redirect( '/' )
+        # save/update of book
         elif book_form.validate():
             book = Book.query.get(id)
             book.title = request.form['title']
@@ -580,8 +581,14 @@ def book(id):
                         else:
                             sql="insert into book_series_link (book_id, series_id, book_num) values ( {}, {}, {} )".format( request.form['bsl-book_id-{}'.format(cnt)], request.form['bsl-series_id-{}'.format(cnt)], request.form['bsl-book_num-{}'.format(cnt)])
                         db.engine.execute( sql )
-                        cnt=cnt+1
-
+            db.session.commit()
+            # reset rating on this series as the book has changed (and maybe the rating has changed)
+            for field in request.form:
+                if 'bsl-book_id-' in field and field != 'bsl-book_id-NUM':
+                    cnt=int(re.findall( '\d+', field )[0])
+                    s=Series.query.get(request.form['bsl-series_id-{}'.format(cnt)])
+                    s.calcd_rating = CalcAvgRating(s.id)
+                    cnt=cnt+1
             db.session.commit()
             st.SetMessage( "Successfully Updated Book (id={})".format(id) )
         else:
diff --git a/series.py b/series.py
index 71cf7cb..e043c5d 100644
--- a/series.py
+++ b/series.py
@@ -42,8 +42,8 @@ class SeriesForm(FlaskForm):
 def CalcAvgRating(sid):
     res=db.engine.execute("select round(avg(to_number(r.name, '99')),1) as rating from book b, rating r, series s, book_series_link bsl where s.id={} and s.id = bsl.series_id and bsl.book_id = b.id and b.rating = r.id and r.name ~ E'^\\\\d+$'".format(sid))
     for row in res:
-        print( row )
-    return row.rating
+        rating = row.rating
+    return rating
 
 def ListOfSeriesWithMissingBooks():
     res=db.engine.execute("select id, title, num_books, count from ( select s.id, s.title, s.num_books, count(bsl.book_id) from series s, book_series_link bsl where s.id = bsl.series_id group by s.id ) as foo where num_books > count")
@@ -121,6 +121,23 @@ def series(id):
         form = SeriesForm(request.values, obj=series)
     return render_template("series.html", form=form, page_title=page_title, message=st.GetMessage(), alert=st.GetAlert() )
 
+################################################################################
+# /series/rating_reset -> forces a reset of calculated ratings of all series
+################################################################################
+@app.route("/seriess/rating_reset", methods=["GET"])
+def reset_all_series_ratings():
+    s_list = Series.query.all()
+    try:
+        for s in s_list:
+           s.calcd_rating = CalcAvgRating(s.id)
+        db.session.commit()
+        st.SetMessage("Successfully reset calculated average ratings for all series");
+        return render_template("base.html", message=st.GetMessage(), alert=st.GetAlert() )
+    except:
+        st.SetAlert("danger")
+        st.SetMessage("Failed to reset calculated average rating for all series");
+        return render_template("base.html", message=st.GetMessage(), alert=st.GetAlert() )
+
 ################################################################################
 # Gets the Series matching id from DB, helper func in jinja2 code to show books
 ################################################################################
diff --git a/templates/base.html b/templates/base.html
index 260289b..ea6ec04 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -93,6 +93,7 @@
 						<a class="dropdown-item" href="{{url_for('ratings')}}">Show Ratings</a>
 						<a class="dropdown-item" href="{{url_for('new_loan')}}">Create new Loan</a>
 						<a class="dropdown-item" href="{{url_for('loans')}}">Show Loans</a>
+						<a class="dropdown-item" href="{{url_for('reset_all_series_ratings')}}">Recalculate all series ratings</a>
 					</div class="dropdow-menu">
 				</div class="nav-item dropdown">
 			</div clas="navbar-nav">