diff --git a/fsl/data/image.py b/fsl/data/image.py
index d6b1380ffeda1dca227a1df7ce01556b8471e57a..17a4d5ab6c96714241dc420792ea4272e6235f9e 100644
--- a/fsl/data/image.py
+++ b/fsl/data/image.py
@@ -761,7 +761,7 @@ EXTENSION_DESCRIPTIONS = ['Compressed NIFTI images',
                           'ANALYZE75 images',
                           'NIFTI/ANALYZE75 headers',
                           'Compressed NIFTI/ANALYZE75 images',
-                          'Compressed images']
+                          'Compressed NIFTI/ANALYZE75 headers']
 """Descriptions for each of the extensions in :data:`ALLOWED_EXTENSIONS`. """