diff --git a/src/README.rst b/src/README.rst
index 97a62b6..3e2886d 100644
--- a/src/README.rst
+++ b/src/README.rst
@@ -285,10 +285,6 @@ The following fields MUST appear in exactly this order::
     DueEnd: <YYYY-MM-DD>             # OPTIONAL
     Description: <first line>
                  <continuation lines>
-    AcceptanceCriteria: <first line>  # OPTIONAL, set at in-progress
-                        <continuation lines>
-    Acceptance: <first line>          # OPTIONAL, set at done
-                <continuation lines>
 
 Field Semantics
 ---------------
@@ -320,20 +316,6 @@ Field Semantics
 * **DueStart / DueEnd**:
   * Optional.
   * If only one is present, the other is implicitly equal to it.
-* **AcceptanceCriteria**:
-  * Optional. Set when transitioning to ``in-progress``.
-  * Defines what must be true for the issue to be considered done.
-  * Follows the same indentation rules as ``Description``.
-  * ``AcceptanceCriteria:`` occupies 20 characters. Content begins at column 21.
-  * Continuation lines MUST be indented with 20 spaces.
-  * Immutable after being set.
-* **Acceptance**:
-  * Optional. Set when transitioning to ``done``.
-  * Records what was delivered against the acceptance criteria.
-  * Follows the same indentation rules as ``Description``.
-  * ``Acceptance:`` occupies 12 characters. Content begins at column 13.
-  * Continuation lines MUST be indented with 12 spaces.
-  * Immutable after being set.
 
 Description Block
 -----------------
@@ -360,8 +342,6 @@ the scope of an issue, the issue MUST be cancelled and a new issue created.
 Fields that MAY change after creation:
 
 * ``Status`` (via transition commits)
-* ``AcceptanceCriteria`` (set once at ``in-progress`` transition, immutable after)
-* ``Acceptance`` (set once at ``done`` transition, immutable after)
 
 Fields that MUST NOT change after creation:
 
@@ -459,20 +439,17 @@ Transition Details
 **``todo(<ID>): in-progress``** — Start work.
 
 * Branch: MUST be on ``develop``.
-* Body: the acceptance criteria for the issue.
-* The ``AcceptanceCriteria`` field on the issue is set from the body of
-  this commit. It defines what must be true for the issue to be considered
-  done.
+* Body: acceptance criteria — defines what must be true for the issue to
+  be considered done. This is the contract between the person starting work
+  and the person reviewing it.
 * After this commit, the issue branch ``<Type>/<ID>`` may be created from
   ``develop``.
 
 **``todo(<ID>): done``** — Complete work.
 
 * Branch: MUST be on ``<Type>/<ID>``.
-* Body: acceptance statement — what was delivered against the acceptance
-  criteria.
-* The ``Acceptance`` field on the issue is set from the body of this
-  commit.
+* Body: acceptance — records what was delivered against the acceptance
+  criteria defined in the ``in-progress`` commit.
 * After this commit, the issue branch may be merged into ``develop`` using
   ``--no-ff``.
 
@@ -643,8 +620,7 @@ Starting work (MUST be on ``develop``)::
     mime-todo start <id> --acceptance-criteria "What must be true for this to be done"
 
 This produces a ``todo(<ID>): in-progress`` commit. The
-``--acceptance-criteria`` text is stored in the issue's
-``AcceptanceCriteria`` field and becomes the commit body. The issue branch
+``--acceptance-criteria`` text becomes the commit body. The issue branch
 ``<Type>/<ID>`` may then be created by the user::
 
     git checkout -b feature/<id>
@@ -653,9 +629,9 @@ Completing work (MUST be on ``<Type>/<ID>``)::
 
     mime-todo done <id> --acceptance "What was delivered against the criteria"
 
-This produces a ``todo(<ID>): done`` commit. The ``--acceptance`` text is
-stored in the issue's ``Acceptance`` field and becomes the commit body.
-The issue branch may then be merged into ``develop`` using ``--no-ff``.
+This produces a ``todo(<ID>): done`` commit. The ``--acceptance`` text
+becomes the commit body. The issue branch may then be merged into
+``develop`` using ``--no-ff``.
 
 Holding an issue (MUST be on ``<Type>/<ID>``)::