diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/koodi.rb b/koodi.rb
index 932f2b3..c202c26 100644
--- a/koodi.rb
+++ b/koodi.rb
@@ -1 +1,5 @@
 # kirjoita koodi tänne
+
+def summa(eka, toka)
+  eka + toka
+end
\ No newline at end of file