diff --git a/legacy/eet/src/lib/Eet.h b/legacy/eet/src/lib/Eet.h
index 623219f458..0171381cdf 100644
--- a/legacy/eet/src/lib/Eet.h
+++ b/legacy/eet/src/lib/Eet.h
@@ -637,6 +637,9 @@ extern "C" {
     * endian-independant serialised data chunks for transmission across a
     * a network or more.
     *
+    * The function pointers to the list and hash table functions are only 
+    * needed if you use those data types, else you can pass NULL instead.
+    *
     * Example:
     *
     * @code