diff --git a/report.tex b/report.tex
index 9fd2158..bc2ca59 100644
--- a/report.tex
+++ b/report.tex
@@ -120,7 +120,7 @@
     \begin{equation}
       \dd{l^2} = \left( 1+\frac{M}{2r} \right)^4 (\dd{r^2} + r^2 \dd{\Omega^2})
     \end{equation}
-    is conformally flat, with the conformal factor
+    is conformally flat, we can define a conformal metric $\tensor{\tilde{\gamma}}{_i_j}$ by $\tensor{\tilde{\gamma}}{_i_j} = \psi^{-4} \tensor{\gamma}{_i_j}$, where
     \begin{equation}
       \psi = 1 + \frac{M}{2r}.
     \end{equation}