diff --git a/src/proto_alpha/lib_protocol/sc_rollup_commitment_storage.mli b/src/proto_alpha/lib_protocol/sc_rollup_commitment_storage.mli
index 39e713e3b6221cbed5510d1fe6e3a406dae08804..d8fc3d81bacfdbaa580cf5d94acd4e5484f5cde7 100644
--- a/src/proto_alpha/lib_protocol/sc_rollup_commitment_storage.mli
+++ b/src/proto_alpha/lib_protocol/sc_rollup_commitment_storage.mli
@@ -55,6 +55,7 @@
 
     {3 Cemented and Disputable commitments}
     Commitments accepted as true by the protocol are referred to as Cemented.
+    A commitment that is not cemented is said to be disputable.
 
     {3 Stakers}
     The Stakers table maps Stakers (implicit accounts) to commitments hashes.