diff --git a/visidata/guide.py b/visidata/guide.py
index b59ad60dc..96ae6dd60 100644
--- a/visidata/guide.py
+++ b/visidata/guide.py
@@ -1,15 +1,15 @@
 '''
 # A Guide to VisiData Guides
-Each guide shows you how to use a particular feature in VisiData.
+Each guide shows you how to use a particular feature in VisiData. Gray guides have not been written yet. Why not contribute one?
 
-  [:keys]Up/Down[/] to move the row cursor
-  [:keys]Enter[/] to view a topic
-  [:keys]Backspace[/] to come back to this list of guides
+- [:keystrokes]Up/Down[/] to move the row cursor
+- [:keystrokes]Enter[/] to view a topic
+- [:keystrokes]Backspace[/] to come back to this list of guides
 '''
 
 import re
 
-from visidata import vd, BaseSheet, Sheet, ItemColumn, Column, VisiData, ENTER
+from visidata import vd, BaseSheet, Sheet, ItemColumn, Column, VisiData, ENTER, RowColorizer
 from visidata import wraptext
 
 vd.guides = {}  # guidename -> guideobj
@@ -28,6 +28,9 @@ class GuideGuide(Sheet):
         Column('points', type=int, getter=lambda c,r: 0),
         Column('max_points', type=int, getter=lambda c,r: 100),
     ]
+    colorizers = [
+            RowColorizer(7, 'color_guide_dne', lambda s,c,r,v: r and r[1] not in vd.guides)
+            ]
     def iterload(self):
         i = 0
         for line in '''
diff --git a/visidata/interface.py b/visidata/interface.py
index 815b704df..ee98e2ee4 100644
--- a/visidata/interface.py
+++ b/visidata/interface.py
@@ -48,6 +48,7 @@
 vd.theme_option('color_clickable', 'underline', 'color of internally clickable item')
 vd.theme_option('color_code', 'bold white on 237', 'color of code sample')
 vd.theme_option('color_h1', 'bold 200', 'color of h1 header')
+vd.theme_option('color_guide_unwritten', '243 on black', 'color of unwritten guides in GuideGuide')
 
 vd.theme_option('force_256_colors', False, 'use 256 colors even if curses reports fewer')