diff --git a/Nim-for-Python-Programmers.md b/Nim-for-Python-Programmers.md
index bbab0a8..4828b4b 100644
--- a/Nim-for-Python-Programmers.md
+++ b/Nim-for-Python-Programmers.md
@@ -106,7 +106,7 @@ var c = Cat(name: "Tom")
 c.increase_age()
 echo c.name, " ", c.age
 ```
-
+Tip: use objects by reference 
 
 ### Inheritance
 
@@ -130,7 +130,14 @@ So, when using inheritance, be sure to inherit using refs, unless you know what
 
 ### Python tuples
 
-Nim Tuples are close to Python nametuples, see [manual](http://nim-lang.org/manual.html#tuples-and-object-types)
+Nim Tuples are close to Python nametuples, see [manual](http://nim-lang.org/manual.html#tuples-and-object-types).
+Use Nim arrays:
+``` Nim
+var a = ["hi", "there"]
+var b = [1, 2, 3]
+echo b[1]
+var c = ["hi", 1]  # no mixed types please
+```
 
 ### Python sets