diff --git a/README.md b/README.md
index 0320b71..e32fff5 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,10 @@ Calculate isomer for given Elements
 FH will expand to Hafnium.
 To use F1H1 write like this: F1H1 or F1H
 
+### usage
+
+isomer [elements]
+
+### examples
+
+isomer C7H16