Merging upstream version 3.0.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/docs/docs/installation.md b/docs/docs/installation.md
index bfa9641..9f80e87 100644
--- a/docs/docs/installation.md
+++ b/docs/docs/installation.md
@@ -11,3 +11,23 @@ or, if you are using [poetry](https://python-poetry.org):
 ```bash
 $ poetry add pendulum
 ```
+
+## Optional features
+
+Pendulum provides optional features that you must explicitly require in order to use them.
+
+These optional features are:
+
+- `test`: Provides a set of helpers to make testing easier by allowing you to control the flow of time.
+
+You can install them by specifying them when installing Pendulum
+
+```bash
+$ pip install pendulum[test]
+```
+
+or, if you are using [poetry](https://python-poetry.org):
+
+```bash
+$ poetry add pendulum[test]
+```