diff --git a/TODO b/TODO
index 5291dea..6b5576e 100644
--- a/TODO
+++ b/TODO
@@ -83,7 +83,7 @@ Description: move the unit test suites to a unit/ subdirectory so that
 ID: 4
 Type: feature
 Title: implement Rabin-Karp rolling hash algorithm
-Status: open
+Status: in-progress
 Priority: high
 Created: 2025-05-05
 Description: After testing a couple of string search algorithms, I've ditched