diff --git a/doc/Eqs/Script.create b/doc/Eqs/Script.create
index 8f473006ab..ee5eadd65f 100755
--- a/doc/Eqs/Script.create
+++ b/doc/Eqs/Script.create
@@ -3,6 +3,7 @@
 latex angle_charmm
 latex angle_class2
 latex angle_cosine
+latex angle_cosine_delta
 latex angle_cosine_squared
 latex angle_harmonic
 latex bond_class2
diff --git a/doc/Eqs/angle_cosine_delta.jpg b/doc/Eqs/angle_cosine_delta.jpg
new file mode 100644
index 0000000000..dca7d73934
Binary files /dev/null and b/doc/Eqs/angle_cosine_delta.jpg differ
diff --git a/doc/Eqs/angle_cosine_delta.tex b/doc/Eqs/angle_cosine_delta.tex
new file mode 100644
index 0000000000..08207edbd3
--- /dev/null
+++ b/doc/Eqs/angle_cosine_delta.tex
@@ -0,0 +1,9 @@
+\documentclass[12pt]{article}
+
+\begin{document}
+
+$$
+  E = K [\cos(\theta) - \cos(\theta_0)]
+$$
+
+\end{document}