diff --git a/edmaths.sty b/edmaths.sty
index 9608a4aa0f918e23ef3cc8da504d13a4e243a85e..3081088cd616ce5d6786c4ad6dbc2662f012561d 100644
--- a/edmaths.sty
+++ b/edmaths.sty
@@ -91,6 +91,8 @@
     \RequirePackage{fancyhdr}
     \pagestyle{fancy}
     \fancyhf{}
+    % NOTE if this is used without `twoside` in \documentclass{...} then fancyhdr will
+    % complain that the 'E' used here is useless.  
     \fancyhead[RO,LE]{\thepage}
     \fancyfoot[RO,LE]{\thepage}
     \fancyhead[LO]{\it\@title}