diff --git a/README.md b/README.md
index ceadc82..34601b0 100644
--- a/README.md
+++ b/README.md
@@ -17,6 +17,8 @@ FEMTIC gives a three-dimensional electrical resistivity structure from the respo
 
 **Data type**: Impedance tensor / Vertical magnetic transfer function / Inter-station horizontal magnetic transfer function / Phase tensor / Apparent resistivity / Phase.
 
+**Inversion algorithm**: Model-space Gauss-Netwon method / Data-space Gauss-Netwon method
+
 **Parallel computation**: Hybrid MPI/OpenMP parallel calculation can be used.
 
 **Model parameter**: Subsurface electrical resistivity / Distortion matrix of galvanic distortion.