diff --git a/README.md b/README.md
index 12e7792..44d76fd 100644
--- a/README.md
+++ b/README.md
@@ -231,5 +231,5 @@ The following external libraries are used in this project:
 - [catch2](https://github.com/catchorg/Catch2), located in `extern/catch2`
 - [picosha2](https://github.com/okdshin/PicoSHA2), located in `extern/picosha2`
 - The assembly routines from [boost.context](https://www.boost.org/doc/libs/1_73_0/libs/context/doc/html/context/overview.html), located in `lib/context_switcher/asm/fcontext`
-
+- [Integer range iterator](https://bitbucket.org/AraK/range/src/default/)