diff --git a/backmatter/colophon.markdown b/backmatter/colophon.markdown
index e0f9fbf..7d32482 100644
--- a/backmatter/colophon.markdown
+++ b/backmatter/colophon.markdown
@@ -6,6 +6,6 @@ Each chapter of this book was written and edited using Emacs, Atom, and LibreOff
 
 These individual chapters were combined together using a cobbled-together collection of Perl, Python, and Javascript tools that transform the results into XeLaTeX (PDF and print version), EPUB, MOBI, or Microsoft Word.
 
-The cover was created using Inkscape. The color scheme uses eight colors of a monochromatic scale. These colors are shared among all of the Rutejìmo novels. Likewise, the "100-01" along the spine indicates this is the second published book ("01") with Rutejìmo as the main character ("100").
+The cover was created using Inkscape. The color scheme uses eight colors of a monochromatic scale. These colors are shared among all of the Rutejìmo novels. Likewise, the "0100-01" along the spine indicates this is the second published book ("01") with Rutejìmo as the main character ("0100").
 
 The font used on the cover and interior is Corda in various weights and styles.