diff --git a/.nix-helpers/nixpkgs.nix b/.nix-helpers/nixpkgs.nix
--- a/.nix-helpers/nixpkgs.nix
+++ b/.nix-helpers/nixpkgs.nix
@@ -20,9 +20,9 @@
     if isNull nixpkgs
       then
         builtins.fetchTarball {
-          # Recent version of nixpkgs master as of 2020-03-01.
-          url = "https://github.com/NixOS/nixpkgs/archive/4f36e9f9a33da034327188ddebc3aecb3633e4d7.tar.gz";
-          sha256 = "sha256:0aa3aldp6m962hx0qzkizkwvamwv2c4yijk6g515dx7h7f5xrary";
+          # Recent version of nixpkgs master as of 2020-03-03.
+          url = "https://github.com/NixOS/nixpkgs/archive/bd2c1d72c5a77bfc78693c5b6d121a9e8bb59e6f.tar.gz";
+          sha256 = "sha256:0r6lbsz5a0yn6x96y890xvycc1h6la84k2hd3ig5c8irknxdbx22";
         }
       else nixpkgs;
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,17 @@
+## 3.1.0.1
+
+* Correct the solarized colours
+  [#148](https://github.com/cdepillabout/termonad/pull/148).
+  Thanks [@craigem](https://github.com/craigem)!
+
+* Add an example showing Gruvbox colours
+  [#149](https://github.com/cdepillabout/termonad/pull/149).
+  Thanks again [@craigem](https://github.com/craigem)!
+
+* Set an upperbound on `base` so we make sure that only GHC-8.8 is used.  Some
+  of the dependencies of Termonad don't support GHC-8.10 yet.
+
+
 ## 3.1.0.0
 
 * Fix up deprecated functions used in Setup.hs.  This should allow Termonad to
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -16,6 +16,11 @@
 
 ![image of Termonad](./img/termonad.png)
 
+Termonad was
+[featured on an episode](https://www.youtube.com/watch?v=TLNr_gBv5HY) of
+[DistroTube](https://www.youtube.com/channel/UCVls1GmFKf6WlTraIb_IaJg).
+This video gives a short overview of Termonad.
+
 <!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
 **Table of Contents**
 
diff --git a/example-config/ExampleGruvboxColourExtension.hs b/example-config/ExampleGruvboxColourExtension.hs
new file mode 100644
--- /dev/null
+++ b/example-config/ExampleGruvboxColourExtension.hs
@@ -0,0 +1,146 @@
+{-# LANGUAGE OverloadedStrings #-}
+-- | This is an example Termonad configuration that shows how to use the
+-- Gruvbox colour scheme https://github.com/morhetz/gruvbox
+
+module Main where
+
+import Termonad
+  ( CursorBlinkMode(CursorBlinkModeOn)
+  , Option(Set)
+  , ShowScrollbar(ShowScrollbarNever)
+  , TMConfig
+  , confirmExit
+  , cursorBlinkMode
+  , defaultConfigOptions
+  , defaultTMConfig
+  , options
+  , showMenu
+  , showScrollbar
+  , start
+  , FontConfig
+  , FontSize(FontSizePoints)
+  , defaultFontConfig
+  , fontConfig
+  , fontFamily
+  , fontSize
+  )
+import Termonad.Config.Colour
+  ( AlphaColour
+  , ColourConfig
+  , Palette(ExtendedPalette)
+  , addColourExtension
+  , createColour
+  , createColourExtension
+  , defaultColourConfig
+  , backgroundColour
+  , foregroundColour
+  , palette
+  )
+import Termonad.Config.Vec (Vec((:*), EmptyVec), N8)
+
+-- This is our main 'TMConfig'.  It holds all of the non-colour settings
+-- for Termonad.
+--
+-- This shows how a few settings can be changed.
+myTMConfig :: TMConfig
+myTMConfig =
+  defaultTMConfig
+    { options =
+        defaultConfigOptions
+          { showScrollbar = ShowScrollbarNever
+          , confirmExit = False
+          , showMenu = False
+          , cursorBlinkMode = CursorBlinkModeOn
+          , fontConfig = fontConf
+          }
+    }
+
+-- This is our Gruvbox dark 'ColourConfig'.  It holds all of our dark-related settings.
+gruvboxDark :: ColourConfig (AlphaColour Double)
+gruvboxDark =
+  defaultColourConfig
+    -- Set the default foreground colour of text of the terminal.
+    { foregroundColour = Set (createColour 213 196 161) -- fg2
+    , backgroundColour = Set (createColour  40  40  40) -- bg0
+    -- Set the extended palette that has 2 Vecs of 8 Gruvbox palette colours
+    , palette = ExtendedPalette gruvboxDark1 gruvboxDark2
+    }
+  where
+    gruvboxDark1 :: Vec N8 (AlphaColour Double)
+    gruvboxDark1 =
+         createColour  40  40  40 -- bg0
+      :* createColour 204  36  29 -- red.1
+      :* createColour 152 151  26 -- green.2
+      :* createColour 215 153  33 -- yellow.3
+      :* createColour  69 133 136 -- blue.4
+      :* createColour 177  98 134 -- purple.5
+      :* createColour 104 157 106 -- aqua.6
+      :* createColour 189 174 147 -- fg3
+      :* EmptyVec
+
+    gruvboxDark2 :: Vec N8 (AlphaColour Double)
+    gruvboxDark2 =
+         createColour 124 111 100 -- bg4
+      :* createColour 251  71  52 -- red.9
+      :* createColour 184 187  38 -- green.10
+      :* createColour 250 189  47 -- yellow.11
+      :* createColour 131 165 152 -- blue.12
+      :* createColour 211 134 155 -- purple.13
+      :* createColour 142 192 124 -- aqua.14
+      :* createColour 235 219 178 -- fg1
+      :* EmptyVec
+
+-- This is our Gruvbox light 'ColourConfig'.  It holds all of our dark-related settings.
+gruvboxLight :: ColourConfig (AlphaColour Double)
+gruvboxLight =
+  defaultColourConfig
+    -- Set the default foreground colour of text of the terminal.
+    { foregroundColour = Set (createColour  60  56  54) -- fg1
+    , backgroundColour = Set (createColour 251 241 199) -- bg0
+    -- Set the extended palette that has 2 Vecs of 8 Gruvbox palette colours
+    , palette = ExtendedPalette gruvboxLight1 gruvboxLight2
+    }
+  where
+    gruvboxLight1 :: Vec N8 (AlphaColour Double)
+    gruvboxLight1 =
+         createColour 251 241 199 -- bg0
+      :* createColour 204  36  29 -- red.1
+      :* createColour 152 151  26 -- green.2
+      :* createColour 215 153  33 -- yellow.3
+      :* createColour  69 133 136 -- blue.4
+      :* createColour 177  98 134 -- purple.5
+      :* createColour 104 157 106 -- aqua.6
+      :* createColour 102  82  84 -- fg3
+      :* EmptyVec
+
+    gruvboxLight2 :: Vec N8 (AlphaColour Double)
+    gruvboxLight2 =
+         createColour 168 153 132 -- bg4
+      :* createColour 157   0   6 -- red.9
+      :* createColour 121 116  14 -- green.10
+      :* createColour 181 118  20 -- yellow.11
+      :* createColour   7 102 120 -- blue.12
+      :* createColour 143  63 113 -- purple.13
+      :* createColour  66 123  88 -- aqua.14
+      :* createColour  60  56  54 -- fg1
+      :* EmptyVec
+
+
+-- This defines the font for the terminal.
+fontConf :: FontConfig
+fontConf =
+  defaultFontConfig
+    { fontFamily = "Monospace"
+    , fontSize = FontSizePoints 12
+    }
+
+main :: IO ()
+main = do
+  -- First, create the colour extension based on either Gruvboxmodules.
+  myColourExt <- createColourExtension gruvboxDark
+
+  -- Update 'myTMConfig' with our colour extension.
+  let newTMConfig = addColourExtension myTMConfig myColourExt
+
+  -- Start Termonad with our updated 'TMConfig'.
+  start newTMConfig
diff --git a/example-config/ExampleSolarizedColourExtension.hs b/example-config/ExampleSolarizedColourExtension.hs
--- a/example-config/ExampleSolarizedColourExtension.hs
+++ b/example-config/ExampleSolarizedColourExtension.hs
@@ -1,10 +1,11 @@
+{-# LANGUAGE OverloadedStrings #-}
 -- | This is an example Termonad configuration that shows how to use the
 -- Solarized colour scheme https://ethanschoonover.com/solarized/
 
 module Main where
 
 import Termonad
-  ( CursorBlinkMode(CursorBlinkModeOff)
+  ( CursorBlinkMode(CursorBlinkModeOn)
   , Option(Set)
   , ShowScrollbar(ShowScrollbarNever)
   , TMConfig
@@ -16,6 +17,12 @@
   , showMenu
   , showScrollbar
   , start
+  , FontConfig
+  , FontSize(FontSizePoints)
+  , defaultFontConfig
+  , fontConfig
+  , fontFamily
+  , fontSize
   )
 import Termonad.Config.Colour
   ( AlphaColour
@@ -43,7 +50,8 @@
           { showScrollbar = ShowScrollbarNever
           , confirmExit = False
           , showMenu = False
-          , cursorBlinkMode = CursorBlinkModeOff
+          , cursorBlinkMode = CursorBlinkModeOn
+          , fontConfig = fontConf
           }
     }
 
@@ -60,7 +68,7 @@
   where
     solarizedDark1 :: Vec N8 (AlphaColour Double)
     solarizedDark1 =
-         createColour   7  54  66 -- base02, background highlights
+         createColour   7  54  66 -- base02
       :* createColour 220  50  47 -- red
       :* createColour 133 153   0 -- green
       :* createColour 181 137   0 -- yellow
@@ -72,13 +80,13 @@
 
     solarizedDark2 :: Vec N8 (AlphaColour Double)
     solarizedDark2 =
-         createColour   0  43  54 -- base03, background
+         createColour   0  43  54 -- base03
       :* createColour 203  75  22 -- orange
-      :* createColour  88 110 117 -- base01, comments / secondary text
-      :* createColour 131 148 150 -- base0, body text / default code / primary content
-      :* createColour 147 161 161 -- base1, optional emphasised content
-      :* createColour 108 113 196 -- violet
+      :* createColour  88 110 117 -- base01
       :* createColour 101 123 131 -- base00
+      :* createColour 131 148 150 -- base0
+      :* createColour 108 113 196 -- violet
+      :* createColour 147 161 161 -- base1
       :* createColour 253 246 227 -- base3
       :* EmptyVec
 
@@ -95,31 +103,39 @@
   where
     solarizedLight1 :: Vec N8 (AlphaColour Double)
     solarizedLight1 =
-         createColour 238 232 213 -- base2, background highlights
+         createColour   7  54  66 -- base02
       :* createColour 220  50  47 -- red
       :* createColour 133 153   0 -- green
       :* createColour 181 137   0 -- yellow
       :* createColour  38 139 210 -- blue
       :* createColour 211  54 130 -- magenta
       :* createColour  42 161 152 -- cyan
-      :* createColour   7  54  66 -- base02
+      :* createColour 238 232 213 -- base2
       :* EmptyVec
 
     solarizedLight2 :: Vec N8 (AlphaColour Double)
     solarizedLight2 =
-         createColour 253 246 227 -- base3, background
+         createColour   0  43  54 -- base03
       :* createColour 203  75  22 -- orange
-      :* createColour 147 161 161 -- base1, comments / secondary text
-      :* createColour 101 123 131 -- base00, body text / default code / primary content
-      :* createColour  88 110 117 -- base01, optional emphasised content
-      :* createColour 108 113 196 -- violet
+      :* createColour  88 110 117 -- base01
+      :* createColour 101 123 131 -- base00
       :* createColour 131 148 150 -- base0
-      :* createColour   0  43  54 -- base03
+      :* createColour 108 113 196 -- violet
+      :* createColour 147 161 161 -- base1
+      :* createColour 253 246 227 -- base3
       :* EmptyVec
 
+-- This defines the font for the terminal.
+fontConf :: FontConfig
+fontConf =
+  defaultFontConfig
+    { fontFamily = "Monospace"
+    , fontSize = FontSizePoints 12
+    }
+
 main :: IO ()
 main = do
-  -- First, create the colour extension based on either Solarixed modules.
+  -- First, create the colour extension based on either Solarized modules.
   myColourExt <- createColourExtension solarizedDark
 
   -- Update 'myTMConfig' with our colour extension.
diff --git a/termonad.cabal b/termonad.cabal
--- a/termonad.cabal
+++ b/termonad.cabal
@@ -1,5 +1,5 @@
 name:                termonad
-version:             3.1.0.0
+version:             3.1.0.1
 synopsis:            Terminal emulator configurable in Haskell
 description:         Please see <https://github.com/cdepillabout/termonad#readme README.md>.
 homepage:            https://github.com/cdepillabout/termonad
@@ -54,7 +54,8 @@
                      , Termonad.Types
                      , Termonad.XML
   other-modules:       Paths_termonad
-  build-depends:       base >= 4.13 && < 5
+  -- Termonad only supports GHC-8.8
+  build-depends:       base >= 4.13 && < 4.14
                      , adjunctions
                      , classy-prelude
                      , colour
@@ -199,6 +200,20 @@
 
 executable termonad-example-colour-extension
   main-is:             example-config/ExampleColourExtension.hs
+  build-depends:       base
+                     , termonad
+                     , colour
+                     , singletons
+  default-language:    Haskell2010
+  ghc-options:         -Wall -Wincomplete-uni-patterns -Wincomplete-record-updates -threaded -rtsopts -with-rtsopts=-N
+
+  if flag(buildexamples)
+    buildable:         True
+  else
+    buildable:         False
+
+executable termonad-example-colour-extension-gruvbox
+  main-is:             example-config/ExampleGruvboxColourExtension.hs
   build-depends:       base
                      , termonad
                      , colour
diff --git a/test/readme/README.lhs b/test/readme/README.lhs
--- a/test/readme/README.lhs
+++ b/test/readme/README.lhs
@@ -16,6 +16,11 @@
 
 ![image of Termonad](./img/termonad.png)
 
+Termonad was
+[featured on an episode](https://www.youtube.com/watch?v=TLNr_gBv5HY) of
+[DistroTube](https://www.youtube.com/channel/UCVls1GmFKf6WlTraIb_IaJg).
+This video gives a short overview of Termonad.
+
 <!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc -->
 **Table of Contents**
 
