diff --git a/CHANGELOG.md b/CHANGELOG.md
index 04b8670f..45fe1392 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@ This project uses the changelog in accordance with [keepchangelog](http://keepac
 - Added `hf mf cwipe` command. It wipes "magic Chinese" card. For 1a generation it uses card's "wipe" command. For gen1a and gen1b it uses a write command. (Merlok)
 - Added to `hf mf nested` source key check before attack (Merlok)
 - Added to `hf mf nested` after attack it checks all found keys on non-open sectors (Merlok)
+- `hf mf chk` Added setings to set iso14443a operations timeout. default timeout set to 500us (Merlok)
 
 ## [3.0.1][2017-06-08]