diff --git a/TODO b/TODO
index 21c6b2fd..e938fedb 100644
--- a/TODO
+++ b/TODO
@@ -1,3 +1,7 @@
+- we need im_guess_eprefix(), use it to find plugins
+
+  look for plugins in eprefix/lib/vips-7.15
+
 - note new VMask constructor in docs
 
   test new VMask constructor from python