diff --git a/docs/sophia.md b/docs/sophia.md
index 4384b69..8870628 100644
--- a/docs/sophia.md
+++ b/docs/sophia.md
@@ -79,7 +79,7 @@ The main unit of code in Sophia is the *contract*.
 - A contract instance is an entity living on the block chain (or in a state
   channel). Each instance has an address that can be used to call its
   entrypoints, either from another contract or in a call transaction.
-- A contract may define a type `state` encapsulating its local
+- A contract may define a type `state` encapsulating its local mutable
   state. When creating a new contract the `init` entrypoint is executed and the
   state is initialized to its return value.