diff --git a/CHANGELOG.md b/CHANGELOG.md
index f909ed1..e65eb87 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,8 @@
 This document contains the nifti_mrs_tools release history in reverse chronological order.
 
-1.0.3 (Wednesday 6th December 2023)
+1.1.0 (Wednesday 6th December 2023)
 -----------------------------------
+- Update definitions to NIfTI-MRS V0.8
 - Fixes issue with displaying spectra with a singleton dimension
 - Code spelling changes.
 
diff --git a/src/nifti_mrs/definitions.py b/src/nifti_mrs/definitions.py
index 4bdffb3..ef28b3f 100644
--- a/src/nifti_mrs/definitions.py
+++ b/src/nifti_mrs/definitions.py
@@ -8,7 +8,7 @@
 
 # Define nifti-mrs version number here.
 # First element is major version, second is minor
-nifti_mrs_version = [0, 7]
+nifti_mrs_version = [0, 8]
 
 # Possible dimension tags and descriptions
 dimension_tags = {"DIM_COIL": "For storage of data from each individual receiver coil element.",
@@ -34,6 +34,7 @@
 
 # Defined metadata fields
 # # 5.1 MRS specific Tags
+# 'SpectralWidth'
 # 'EchoTime'
 # 'RepetitionTime'
 # 'InversionTime'
@@ -80,6 +81,11 @@
 # Format is a dict of tuples containing (type, unit string, doc string, anonymisation state)
 standard_defined = {
     # 5.1 MRS specific Tags
+    'SpectralWidth':
+        (float,
+         'Hz',
+         'The spectral bandwidth of the MR signal that is sampled. Inverse of the dwell time. NIfTI-MRS standard compliant software will always preferentially infer the spectral width from the dwell time stored in the NIfTI pixdim field. Units: hertz',
+         False),
     'EchoTime':
         (float,
          's',