Fix docu of PreconditionChebyshev regardin degree

diff --git a/include/deal.II/lac/precondition.h b/include/deal.II/lac/precondition.h
index f343250cf41a4eb3ad0a0564ccdcc8724066f4f8..fe72d7f478e4687a9acac914f839ad47c528f040 100644 (file)
--- a/include/deal.II/lac/precondition.h
+++ b/include/deal.II/lac/precondition.h
@@ -1615,7 +1615,8 @@ public:
     /**
      * This determines the degree of the Chebyshev polynomial. The degree of
      * the polynomial gives the number of matrix-vector products to be
-     * performed for one application of the vmult() operation. Degree one
+     * performed for one application of the step() operation. During vmult(),
+     * the method performs `(degree-1)` matrix-vector products. Degree one
      * corresponds to a damped Jacobi method.
      *
      * If the degree is set to numbers::invalid_unsigned_int, the algorithm