diff --git a/glossary.tex b/glossary.tex
index 697a83ab0efcfad43fbc49a0e150c13fc8db717c..99687013facd5ae04c2bc7b209be68a74c202995 100644
--- a/glossary.tex
+++ b/glossary.tex
@@ -336,6 +336,11 @@
   prefixfirst={a\space},
   ]{npc}{NPC}{Non-Player Character}
 
+\newacronym[
+  description={books work a little like `print on demand', but it's faster, and cheaper, and if you don't like the paper-quality, you have only yourself to blame},
+  prefix={a\space},
+  ]{piy}{PiY}{Print it Yourself}
+
 \newglossaryentry{weight}{
   name={Weight Rating},
   text={Weight},