forgot solid

diff --git a/physics_compact/solid.tex b/physics_compact/solid.tex
index ed9bddb..0d5b1b2 100644 (file)
--- a/physics_compact/solid.tex
+++ b/physics_compact/solid.tex
@@ -2,6 +2,10 @@
 
 \chapter{Atomic structure}
 
+\chapter{Reciprocal lattice}
+
+Example of primitive cell ...
+
 \chapter{Electronic structure}
 
 \section{Noninteracting electrons}