diff --git a/doc/writing_a_test.md b/doc/writing_a_test.md
index 4d7425d64bb5e5a07f32602adf58bcd98759c9cc..d13f11ef19be30a5434aca1066a24c374ba46b1b 100644
--- a/doc/writing_a_test.md
+++ b/doc/writing_a_test.md
@@ -264,6 +264,10 @@ sp.call('flirt -in {} -ref {} -out {} -omat {}'.format(
     inimg, refimg, outimg, outxform).split())
 ```
 
+If you want to perform your own evaluation within your `feedsRun` script, you
+may find some of the routines in the `pyfeeds.evaluate` module useful. For
+example, the `evalImage` routine can be used to compare two NIfTI images.
+
 
 ## Other examples