minor readme enhancements
diff --git a/.gitignore b/.gitignore
index d2d414b..fc3c071 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,7 @@
+# Editor's files
 *.swp
 *.swo
 *.pyc
+
+# Build artefacts
+/build/