diff --git a/changelog.md b/changelog.md
index 3619f01..d957e08 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,8 @@
 # Changelog
 
+## 20th May 2024 (V0.10)
+- Add `DIM_METCYCLE` for storing metabolite cycled data to the dimensions definitions.
+
 ## 1st April 2024 (V0.9)
 - Definitions are now packaged as a machine-readable JSON file.
 
diff --git a/definitions.json b/definitions.json
index 7bcc8f5..2a6266e 100644
--- a/definitions.json
+++ b/definitions.json
@@ -15,7 +15,8 @@
         "DIM_USER_0": "User defined dimension.",
         "DIM_USER_1": "User defined dimension.",
         "DIM_USER_2": "User defined dimension.",
-        "DIM_ISIS": "Dimension for storing image-selected in vivo spectroscopy (ISIS) acquisitions."},
+        "DIM_ISIS": "Dimension for storing image-selected in vivo spectroscopy (ISIS) acquisitions.",
+        "DIM_METCYCLE": "For storing metabolite cycled data."},
 
     "required": {
         "SpectrometerFrequency": {
diff --git a/specification.MD b/specification.MD
index e71fae3..292baa4 100644
--- a/specification.MD
+++ b/specification.MD
@@ -195,6 +195,10 @@ The optional data dimensions may also be used to store alternative information (
    <td>“DIM_ISIS”</td>
    <td>Dimension for storing image-selected in vivo spectroscopy (ISIS) acquisitions.</td>
   </tr>
+  <tr>
+   <td>“DIM_METCYCLE”</td>
+   <td>For storing metabolite cycled data.</td>
+  </tr>
 </table>