diff --git a/GLOSSARY.md b/GLOSSARY.md
index 2dd3c16cf..92bf8a6b5 100644
--- a/GLOSSARY.md
+++ b/GLOSSARY.md
@@ -45,3 +45,4 @@ If you encounter one of those expressions for the first time, it might be worth
 - `refactor` ([#9](https://github.com/reactjs/it.reactjs.org/issues/9))
 - `event handler` ([#10](https://github.com/reactjs/it.reactjs.org/issues/10))
 - `event listener` ([#10](https://github.com/reactjs/it.reactjs.org/issues/10))
+- `mount` and `unmount` in sentences ([#108](https://github.com/reactjs/it.reactjs.org/issues/108))