diff --git a/modutils/modutils.c b/modutils/modutils.c
index 84300d9..ef4134a 100644
--- a/modutils/modutils.c
+++ b/modutils/modutils.c
@@ -190,6 +190,11 @@
 	return errno;
 }
 
+/* Note: not suitable for delete_module() errnos.
+ * For them, probably only EWOULDBLOCK needs explaining:
+ * "Other modules depend on us". So far we don't do such
+ * translation and don't use moderror() for removal errors.
+ */
 const char* FAST_FUNC moderror(int err)
 {
 	switch (err) {