diff --git a/PROCESS.md b/PROCESS.md
index 1ebc79e..2510334 100644
--- a/PROCESS.md
+++ b/PROCESS.md
@@ -83,8 +83,13 @@ If a deliverable's execution depends on a group external to Waku, then it should
 
 ### Milestone
 
-A *Milestone* define a completion date and effort estimate for a collection of deliverables,
-across one or several subteams.
+A milestone describes a specific objective we aim to achieve.
+It holds the narrative of **why** we are doing this work and what is the value attached to completing the work.
+
+A milestone usually involve effort from most of the Waku team.
+The work should be organized to prioritise the delivery of complete milestones, over individual deliverables.
+
+Milestone have estimation of effort and date of completion defined.
 
 ### Task