diff --git a/Nim-for-Python-Programmers.md b/Nim-for-Python-Programmers.md
index fe84547..2283042 100644
--- a/Nim-for-Python-Programmers.md
+++ b/Nim-for-Python-Programmers.md
@@ -168,6 +168,7 @@ Use [Nim sequences](http://nim-lang.org/docs/tut1.html#advanced-types-sequences)
 
 Nim arrays and sequences can hold only items of the same type.
 
+Also be aware that mylist[0..2] returns the first 3 elements (not 2), but cause a boundary error if there are less elements.
 
 #### List Comprehensions
 ```