diff --git a/ICFERST/schemas/solvers.rnc b/ICFERST/schemas/solvers.rnc
index 4b2674aaa..006fe41bd 100644
--- a/ICFERST/schemas/solvers.rnc
+++ b/ICFERST/schemas/solvers.rnc
@@ -485,7 +485,7 @@ generic_solver_options =
       ## Relative error
       ##
       ## The solver finishes if the preconditioned error becomes smaller than the original preconditioned error times this value.
-      ## Suggested value: 1.0e-10
+      ## Suggested value: 1.0e-10 without wells, 1.0e-13 with wells
       element relative_error {
          real
       },
diff --git a/ICFERST/schemas/solvers.rng b/ICFERST/schemas/solvers.rng
index 7081309a8..6104626dc 100644
--- a/ICFERST/schemas/solvers.rng
+++ b/ICFERST/schemas/solvers.rng
@@ -79,9 +79,9 @@ by the PETSc library. Many more methods are provided.
   </define>
   <!--
     ####################################################################
-    
+
     options for the different iterative ksp methods
-    
+
     ####################################################################
   -->
   <define name="kspgmres_options">
@@ -146,9 +146,9 @@ http://www-unix.mcs.anl.gov/petsc/petsc-2/snapshots/petsc-dev/docs/manualpages/K
   </define>
   <!--
     ####################################################################
-    
+
     options for the different preconditioners
-    
+
     ####################################################################
   -->
   <define name="pcsor_options">
@@ -509,9 +509,9 @@ Default : 0.1</a:documentation>
   </define>
   <!--
     ####################################################################
-    
+
     all the other solver options
-    
+
     ####################################################################
   -->
   <define name="generic_solver_options">
@@ -519,7 +519,7 @@ Default : 0.1</a:documentation>
       <a:documentation>Relative error
 
 The solver finishes if the preconditioned error becomes smaller than the original preconditioned error times this value.
-Suggested value: 1.0e-10</a:documentation>
+Suggested value: 1.0e-10, 1.0e-13 with wells</a:documentation>
       <ref name="real"/>
     </element>
     <optional>