README: mention lazyness

ebonnal · Jan 23, 2024 · ace78d3 · ace78d3
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diff --git a/README.md b/README.md
@@ -25,7 +25,8 @@ Instantiate a `Stream` by providing a function that returns an `Iterable` (the d
 
 ## 4. apply operations
 
-A `Stream` is ***immutable***: applying an operation returns a child stream independant from the parent.
+- Applying an operation is ***lazy***: it does not compute the elements.
+- A `Stream` is ***immutable***: applying an operation returns a child stream independant from the parent.
 
 ```python
 odd_squares: Stream[int] = (