This module requires the [input](https://github.com/zimfw/zimfw/blob/master/modules/input/README.md) module. Without it, you may experience odd behavior.
Additionally, if you use [syntax-highlighting](https://github.com/zimfw/zimfw/blob/master/modules/syntax-highlighting/README.md), place 'syntax-highlighting' before 'history-substring-search' on the second line of `zmodules` in your `.zimrc`.