diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1792dba..0262a3d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+## 0.2.1 - WIP
+- Linear regression
+
 ## 0.2.0 - 2022-02-21
 - Raise Exception instead of returning null if there is no valid input. By Artem Trokhymchuk @trokhymchuk [thanks for the PR #15](https://github.com/Hi-Folks/statistics/pull/15);
 - PHPStan, level 9
diff --git a/README.md b/README.md
index 4814a5c..e1c6467 100644
--- a/README.md
+++ b/README.md
@@ -48,8 +48,8 @@ Stat class has methods to calculate an average or typical value from a populatio
 - geometricMean(): geometric mean;
 - harmonicMean(): harmonic mean;
 - correlation(): the Pearson’s correlation coefficient for two inputs;
-- covariance(): the sample covariance of two inputs.
-- linearRegression():
+- covariance(): the sample covariance of two inputs;
+- linearRegression(): return the slope and intercept of simple linear regression parameters estimated using ordinary least squares.
 
 #### Stat::mean( array $data )
 Return the sample arithmetic mean of the array _$data_.