diff --git a/TODO.md b/TODO.md
index a7282c6..296a995 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,3 +1,3 @@
 - [ ] Tabs support [#4](https://github.com/Sigmanor/Crypto-Notepad/issues/4)
-- [ ] Make encryption algorithms more safely [#7](https://github.com/Sigmanor/Crypto-Notepad/issues/7)
+- [x] Make encryption algorithms more safely [#7](https://github.com/Sigmanor/Crypto-Notepad/issues/7)
 - [ ] Move project to [own company](https://github.com/Crypto-Notepad).
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