diff --git a/QP_solver/doc_tex/QP_solver_ref/_set_methods.tex b/QP_solver/doc_tex/QP_solver_ref/_set_methods.tex
index 21be29e85b1..c01172d37b1 100644
--- a/QP_solver/doc_tex/QP_solver_ref/_set_methods.tex
+++ b/QP_solver/doc_tex/QP_solver_ref/_set_methods.tex
@@ -13,6 +13,12 @@ necessary to accomodate this entry.}
 of \ccVar\ to \ccc{val}. An existing entry is overwritten. 
 \ccVar\ is enlarged if necessary to accomodate this entry.}
 
+\ccMethod{void set_r (int i, CGAL::Comparison_result rel);}
+{sets the entry $\qprel_i$ of \ccVar\ to \ccc{rel}. \ccc{CGAL::SMALLER}
+means that the $i$-th constraint is of type ``$\leq$'', \ccc{CGAL::EQUAL}
+means ``$=$'', and \ccc{CGAL::LARGER} encodes ``$\geq$''. An existing entry 
+is overwritten. \ccVar\ is enlarged if necessary to accomodate this entry.}
+
 \ccMethod{void set_l (int j, bool is_finite, const NT& val = NT(0));}
 {if \ccc{is_finite}, this sets the entry $l_j$ of \ccVar\ to \ccc{val},
 otherwise it sets $l_j$ to $-\infty$. An existing entry is overwritten.