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--- a/subjects/btreeinsertdata/README.md
+++ b/subjects/btreeinsertdata/README.md
@@ -2,10 +2,14 @@
 
 ### Instructions
 
-Write a function that inserts new data in a binary search tree following the properties of binary search trees.
+Write a function that inserts new data in a `binary search tree` following the special properties of a `binary search trees`.
 
 The nodes must be defined as follows :
 
+### Notions
+
+- [binary search trees](https://en.wikipedia.org/wiki/Binary_search_tree)
+
 ### Expected function
 
 ```go