diff --git a/readme.md b/readme.md
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--- a/readme.md
+++ b/readme.md
@@ -2,7 +2,7 @@
 
 ## Description
 
-transforms a template string to its refined version by substituting its placeholders with concrete values
+`coin` transforms a template string to its refined version by substituting its placeholders with concrete values; hence it can be used as a very basic template engine.
 
 
 ## Building
@@ -36,6 +36,11 @@ transforms a template string to its refined version by substituting its placehol
 - Python 3 interpreter
 
 
+### Explanation
+
+- see `coin -h`
+
+
 ### Examples
 
 #### basic