diff --git a/Interpolation/doc/Interpolation/Interpolation.txt b/Interpolation/doc/Interpolation/Interpolation.txt
index 957e10c2adf..5367c10e265 100644
--- a/Interpolation/doc/Interpolation/Interpolation.txt
+++ b/Interpolation/doc/Interpolation/Interpolation.txt
@@ -93,7 +93,7 @@ The previous definition naturally extends to weighted Voronoi diagrams. These
 diagrams, also known as <em>power diagrams</em>, are obtained by considering weighted points
 (the weight being a scalar) and considering a weighted distance, the <em>power distance</em>,
 defined between two weighted points \f$ (p, \omega_p) \f$ and \f$ (q, \omega_q) \f$ by
-\f$ \Pi( (p, \omega_p), (q, \omega_q) = pq^2 - \omega_p - \omega_q \f$
+\f$ \Pi( (p, \omega_p), (q, \omega_q) ) = pq^2 - \omega_p - \omega_q \f$.
 See \link Subsection_2D_Triangulations_Regular_Description this section \endlink
 of the package \ref PkgTriangulation2Summary for an in-depth description of power diagrams.