Making README file more precise

Change-Id: I8974da7d6a15d81edcf30e6320c7e27aba023cb4
diff --git a/README b/README
index 03719dc..41289e2 100644
--- a/README
+++ b/README
@@ -1,6 +1,6 @@
 Building asciidoc presentation:
 - download and install asciidoc (with slidy) and graphviz
-- from the presentations folder run:
+- from the presentations/<subject>/ folder run:
 	./makeslides
 
 Open a presentation:
@@ -8,7 +8,7 @@
 - use the same keys like in PowerPoint to move forward and back
 
 Building exercises:
-- from exercise folder run:
+- from exercises/egit/<subject>/ folder run:
     make html
   or
     make pdf