diff --git a/fieldsolvers.asciidoc b/fieldsolvers.asciidoc
index 6d6ee9eaaece63f114de2558c45bf4e592ebb399..727fc9324510d099b13409675ab30b7cf563cbb8 100644
--- a/fieldsolvers.asciidoc
+++ b/fieldsolvers.asciidoc
@@ -405,7 +405,7 @@ integrated Green’s function is described in <<bib.qiang2005_fieldsolver>>, <<b
 
 The bounding box defines a minimal rectangular domain including all
 particles. With `BBOXINCR` the bounding box can be enlarged by a factor
-given in percent of the minimal rectangular domain.
+given in percent of the minimal rectangular domain. Default value is 2.0.
 
 [[sec.fieldsolvers.GEOMETRY]]
 === Define Geometry
@@ -416,24 +416,27 @@ details see Chapter link:geometry#chp.geometry[Geometry].
 [[sec.fieldsolvers.ITSOLVER]]
 === Define Iterative Solver
 
-The iterative solver for solving the preconditioned system: `CG`,
+The iterative solver for solving the preconditioned system: `CG` (default),
 `BiCGSTAB` or `GMRES`.
 
 [[sec.fieldsolvers.INTERPL]]
 === Define Interpolation for Boundary Points
 
 The interpolation method for grid points near the boundary: `CONSTANT`,
-`LINEAR` or `QUADRATIC`.
+`LINEAR` (default) or `QUADRATIC`.
 
 [[sec.fieldsolvers.TOL]]
 === Define Tolerance
 
-The tolerance for the iterative solver used by the `MG` solver.
+The tolerance for the iterative solver used by the `SAAMG` solver.
+Default value is 1e-8.
 
 [[sec.fieldsolvers.MAXITERS]]
 === Define Maximal Iterations
 
 The maximal number of iterations the iterative solver performs.
+Default value is 100.
+
 
 [[sec.fieldsolvers.PRECMODE]]
 === Define Preconditioner Behavior