diff --git a/README.rst b/README.rst
index a0cac82d2071e224240e18ac44bae5498bd02aed..e33ebd49ff30795d180613e9c326d05fd6c7473f 100644
--- a/README.rst
+++ b/README.rst
@@ -28,11 +28,13 @@ Main Features
 - Structured/Documented YAML_ input file format
 - Rarefied gas flow effects predictable: Knudsen paradox, Knudsen pump, ...
 - Interface for Gmsh_ meshes
+- Full exposure of the PETSc_ preconditioned iterative solver library
 
 .. _FEniCS: https://fenicsproject.org/
 .. _YAML: https://de.wikipedia.org/wiki/YAML
 .. _XDMF: http://www.xdmf.org/index.php/XDMF_Model_and_Format
 .. _Gmsh: http://gmsh.info/
+.. _PETSc: https://petsc.org/
 
 Installation
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