diff --git a/README.md b/README.md
index d2827b7..d08e4ea 100644
--- a/README.md
+++ b/README.md
@@ -1,38 +1,38 @@
 PHPC - CONJUGATE GRADIENT PROJECT
 
 HOWTO COMPILE AND RUN
 =====================
 
 Requirements : 
 
 - a recent compiler (like gcc or intel)
 - a BLAS library (like openblas or intel MKL)
 
 compile on SCITAS clusters :
 
 ```
 $ module load gcc openblas
 $ git clone ssh://git@c4science.ch/source/CG-PHPC.git
 $ make
 ```
 
 run on a SCITAS cluster interactively :
 
 ```
 $ salloc -N 1 --reservation=phpc-reservation
 $ srun ./conjugategradient lap2D_5pt_n100.mtx
 ```
 You should see this output (timing is indicative) :
 
 ```
 $ srun ./conjugategradient lap2D_5pt_n100.mtx 
 size of matrix = 10000 x 10000
 Call cgsolver() on matrix size (10000 x 10000)
 	[STEP 488] residual = 1.103472E-10
 Time for CG = 36.269389 [s]
 ```
 
-The given example is a 5-points stencil for the 2D laplace problem. The matrix in sparse format.
+The given example is a 5-points stencil for the 2D laplace problem. The matrix is in sparse format.
 
 The matrix format is [Matrix Market format (.mtx extension)](https://sparse.tamu.edu/). You can use other matrices there or create your own.