diff --git a/geneExpressionData/AtlasViewerFormat/README.md b/geneExpressionData/AtlasViewerFormat/README.md
index 0553fb47e5dc8cadea0724969b1ca2b05b101440..254475beafdeb29ddfe7f97a1e0991b9c732c1da 100644
--- a/geneExpressionData/AtlasViewerFormat/README.md
+++ b/geneExpressionData/AtlasViewerFormat/README.md
@@ -1,4 +1,10 @@
 ## Gene expression data in AtlasViewer format
 
-Each folder contains gene expression data in AtlasViewer format for a specific layer (L1, L2, L1&L2) and all cells.
+Each folder contains gene expression data in AtlasViewer format for a specific 
+layer (L1, L2, L1&L2) and all cells.
+
+To visualise patterns, first run AtlasViewer via atlasviewer/launch_aviewer.py. 
+Drag and drop the segmentation file and the visualization widget and then drag 
+and drop the pattern file. Select the genes to visualize form the right pane and
+click "Atlas gene expression" button from the AtlasViewer menu.