diff --git a/examples/theory/multipoles.tex b/examples/theory/multipoles.tex
index 752b32c61d1d88cd8b2208c9ccd1f77b9914c156..0ae9db4525d7597c57d506c99d47f148db193b50 100644
--- a/examples/theory/multipoles.tex
+++ b/examples/theory/multipoles.tex
@@ -69,7 +69,7 @@ Writing this explicitly for each coordinate (using the symmetry of $\overline{\o
 \frac{5}{2} \frac{G r_x}{|\rr|^7} \Xi, \\
  a_y &=& -\frac{Gr_y}{|\rr|^3}M + \frac{1}{2} \frac{G}{|\rr|^5}\left[2r_x Q_{yx} + 2r_yQ_{yy} + 2r_z Q_{yz}\right] - 
 \frac{5}{2} \frac{G r_y}{|\rr|^7} \Xi, \\
- a_y &=& -\frac{Gr_z}{|\rr|^3}M + \frac{1}{2} \frac{G}{|\rr|^5}\left[2r_x Q_{zx} + 2r_yQ_{zy} + 2r_z Q_{zz}\right] - 
+ a_z &=& -\frac{Gr_z}{|\rr|^3}M + \frac{1}{2} \frac{G}{|\rr|^5}\left[2r_x Q_{zx} + 2r_yQ_{zy} + 2r_z Q_{zz}\right] - 
 \frac{5}{2} \frac{G r_z}{|\rr|^7} \Xi, \\
 \end{eqnarray}
 with the common coefficient $\Xi$ defined as: