diff --git a/fsl/utils/parse_data.py b/fsl/utils/parse_data.py
index 90fa56761a6c64aea7f64c75aa1e2e2d3cea42c9..00826db245497bfcab1a6982468b751c3cc6156f 100644
--- a/fsl/utils/parse_data.py
+++ b/fsl/utils/parse_data.py
@@ -16,6 +16,7 @@ to interpret command line arguments as neuroimageing objects (.e.g, NIFTI image
    :nosignatures:
 
     Image
+    ImageOut
     Mesh
     Atlas
 """