diff --git a/README.md b/README.md
index df67f37..6d3e69e 100644
--- a/README.md
+++ b/README.md
@@ -68,7 +68,7 @@ rather than an integer. For example we can convert a base 10 number
 to another base 10 number using a different encoding.
 
 ```ruby
-base = [:Q, :W, :E, :R, :T, :Y, :U, :I, :O, :U]
+base = [:Q, :W, :E, :R, :T, :Y, :U, :I, :O, :P]
 
 "10".b(10).to_a(base)  #=> [:W, :Q]
 ```
diff --git a/demo/01_synopsis.md b/demo/01_synopsis.md
index d1d43fe..01ae4de 100644
--- a/demo/01_synopsis.md
+++ b/demo/01_synopsis.md
@@ -37,7 +37,7 @@ To use a custom character set, use an array of characters as the base
 rather than an integer. For example we can convert a base 10 number
 to another base 10 number but useing a different encoding.
 
-    base = %w[Q W E R T Y U I O U]
+    base = %w[Q W E R T Y U I O P]
 
     "10".b(10).to_a(base)  #=> ["W", "Q"]