diff --git a/README.md b/README.md
index 1696f2f..fb6f1cb 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,14 @@
-# dependencies
+# sat project
+
+## dependencies
 
 * pysat
 * [glucose](https://www.labri.fr/perso/lsimon/glucose/)
+
 ...version 4.1
+
 ...put binary in ***util*** directory
+
 * bzip2
 
 ## gen_core_extensions.py
@@ -14,7 +19,7 @@ Script to generate core extensions.
 |----|---------|-------|--|
 | -i | --instance_dir | ./instances | directory containing the instances |
 | -c | --cores_dir | ./cores_dir | directory containing the cores |
-| -e | --extensions_dir | ./extensions | target directory to store the generated core extensions |
+| -e | --extensions_dir | ./extensions | target directory to store the generated core extensions (creates dir if nonexistent)|
 | -n | --nr_per_instance | 1 | number of extensions per instance |
 | -v | --verbosity | 1 | **1** to print progress, **0** for silent mode |