diff --git a/doc/model.md b/doc/model.md
index 4cadfc9a8071cf03515f48dd53b26159fab76d5a..afde4d84508439a48b50527e4d79d48c4353b9b8 100644
--- a/doc/model.md
+++ b/doc/model.md
@@ -19,7 +19,7 @@ An `Operation` is a piece of data including:
 
 - a type identifier
 - an author (a reference to another entity)
-- a timestamp (there is also 1 or 2 Lamport time that we will describe later)
+- a timestamp (there is also 1 or 2 [Lamport time](#time-is-unreliable))
 - all the data required by that operation type (a message, a status ...)
 - a random [nonce](https://en.wikipedia.org/wiki/Cryptographic_nonce) to ensure we have enough entropy, as the operation identifier is a hash of that data (more on that later)