Add complexity

README.md

@@ -2,10 +2,21 @@
 
 This repository contains implementations of the following series transformations:
 
-* [Aitken's transformation (or delta-squared process)](https://en.wikipedia.org/wiki/Aitken%27s_delta-squared_process)
-* [Richardson's transformation (modify)](https://en.wikipedia.org/wiki/Richardson_extrapolation)
-* [Epsilon transformation](https://www.sciencedirect.com/science/article/pii/S0377042700003551)
-* [G transformation](https://epubs.siam.org/doi/abs/10.1137/0704032?journalCode=sjnaam)
+* [Aitken's transformation (or delta-squared process)](https://en.wikipedia.org/wiki/Aitken%27s_delta-squared_process):
+  - One step: O($n$)
+  - Exhausted: O($n^2$)
+
+* [Richardson's transformation (modify, with given p)](https://en.wikipedia.org/wiki/Richardson_extrapolation):
+  - One step: O($\log n$)
+  - Exhausted: O($(\log n)^2$)
+
+* [Epsilon transformation](https://www.sciencedirect.com/science/article/pii/S0377042700003551):
+  - One step: O($n$)
+  - Exhausted: O($n^2$)
+
+* [G transformation](https://epubs.siam.org/doi/abs/10.1137/0704032?journalCode=sjnaam):
+  - One step: O($n$)
+  - Exhausted: O($n^2$)
 
 ## Usage