diff --git a/examples/mocap/qualisys_hl_commander.py b/examples/mocap/qualisys_hl_commander.py
index 3470a5c00..d109a16ae 100644
--- a/examples/mocap/qualisys_hl_commander.py
+++ b/examples/mocap/qualisys_hl_commander.py
@@ -26,6 +26,9 @@
 
 Set the uri to the radio settings of the Crazyflie and modify the
 rigid_body_name to match the name of the Crazyflie in QTM.
+
+Requires the qualisys optional dependency:
+    pip install cflib[qualisys]
 """
 import asyncio
 import math
diff --git a/pyproject.toml b/pyproject.toml
index 6199bf298..b797bce96 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,6 +50,7 @@ Issues = "https://github.com/bitcraze/crazyflie-lib-python/issues"
 
 [project.optional-dependencies]
 dev = ["pre-commit"]
+qualisys = ["qtm-rt>=3.0.2"]
 
 [tool.setuptools]
 include-package-data = true