diff --git a/core/nwb.misc.yaml b/core/nwb.misc.yaml
index a00251f4..eb591548 100644
--- a/core/nwb.misc.yaml
+++ b/core/nwb.misc.yaml
@@ -268,8 +268,8 @@ groups:
       required: false
     - name: unit
       dtype: text
-      value: volts
-      doc: Unit of measurement. This value is fixed to 'volts'.
+      default_value: volts
+      doc: Unit of measurement. The default value is 'volts'.
       required: false
   - name: waveform_sd
     neurodata_type_inc: VectorData
@@ -295,8 +295,8 @@ groups:
       required: false
     - name: unit
       dtype: text
-      value: volts
-      doc: Unit of measurement. This value is fixed to 'volts'.
+      default_value: volts
+      doc: Unit of measurement. The default value is 'volts'.
       required: false
   - name: waveforms
     neurodata_type_inc: VectorData
@@ -332,8 +332,8 @@ groups:
         required: false
       - name: unit
         dtype: text
-        value: volts
-        doc: Unit of measurement. This value is fixed to 'volts'.
+        default_value: volts
+        doc: Unit of measurement. The default value is 'volts'.
         required: false
   - name: waveforms_index
     neurodata_type_inc: VectorIndex
diff --git a/docs/format/source/format_release_notes.rst b/docs/format/source/format_release_notes.rst
index e64af227..b1cb8693 100644
--- a/docs/format/source/format_release_notes.rst
+++ b/docs/format/source/format_release_notes.rst
@@ -8,6 +8,8 @@ Release Notes
 
 Bug fixes
 ^^^^^^^^^
+- ``Units.waveform_mean``, ``Units.waveform_sd``, and ``Units.waveforms`` now accept a unit other than the default
+  value, ``volts``.
 - Fixed copy-paste error in ``VoltageClampSeries.capacitance_slow`` unit attribute doc, which incorrectly
   referenced ``capacitance_fast``.
 - Fixed ``IntervalSeries.data`` resolution and unit attribute docs, which were verbatim copy-paste from