diff --git a/docs/protocols/protocols_guide_internal-how-1.md b/docs/protocols/protocols_guide_internal-how-1.md
index ebc699afe6d20a21ce21ab05f8ee4329d086576f..4b7fbd6aed3b7f8cb05f1a6650b4183612f225a1 100644
--- a/docs/protocols/protocols_guide_internal-how-1.md
+++ b/docs/protocols/protocols_guide_internal-how-1.md
@@ -40,6 +40,15 @@ Any names should be redacted from the scanning procedure unless permission to be
 
 Review all images and ensure that identifiable information such as participant IDs are redacted (cover with a black rectangle). Ensure identifiable facial features (in sagital views of slice pack positioning) are redacted (cover with a black rectangle).
 
+
+When redacting MRI images, ensure the images are edited *destructively* (i.e., irreversibly).
+The best way to ensure that an image has been edited destructively is by modifying the original image in a program such as Adobe Photoshop, or GIMP, and saving in a format like PNG or JPEG.
+
+{: .warning}
+
+Do not redact MRI images by dragging a black box over them in Microsoft Word, then exporting to PDF.
+The unredacted image is still present in the file, and can be very easily extracted.
+
 Currently, only the owner of the project is able to edit the uploaded protocol. If you would like to suggest changes to someone else's protocol you can do so by emailing the admin team who can then contact the project's owner.
 
 You might want to add a statement such as "available for re-use, but I'm unable to assist with implementation" in the usage notes to clarify the extent of assistance you are able to provide.