diff --git a/docs/unreleased.md b/docs/unreleased.md
index 743c1a54f7..529739242e 100644
--- a/docs/unreleased.md
+++ b/docs/unreleased.md
@@ -8,3 +8,14 @@
 ## neighbors
 
 - Simplified `neighbors.SWINN` to avoid recursion limit and pickling issues.
+
+## decomposition
+
+- Added `decomposition.OnlineSVD` class to perform Singular Value Decomposition.
+- Added `decomposition.OnlinePCA` class to perform Principal Component Analysis.
+- Added `decomposition.OnlineDMD` class to perform Dynamic Mode Decomposition.
+- Added `decomposition.OnlineDMDwC` class to perform Dynamic Mode Decomposition with Control.
+
+## preprocessing
+
+- Added `preprocessing.Hankelizer` class to perform Hankelization of data stream.