diff --git a/docs/powell.tex b/docs/powell.tex
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@@ -1,4 +1,4 @@
-%!TEX root = ceres.tex
+%!TEX root = ceres-solver.tex
 \chapter{Powell's Function}
 \label{chapter:tutorial:powell}
 Consider now a slightly more complicated example -- the minimization of Powell's function. Let $x = \left[x_1, x_2, x_3, x_4 \right]$ and