diff --git a/doc/3.io-files.md b/doc/3.io-files.md
index 31eee8c..c74fc8d 100644
--- a/doc/3.io-files.md
+++ b/doc/3.io-files.md
@@ -381,7 +381,8 @@ Variable         Type          Units          Valid range       Definition
 `ieccd`          Integer                0, 1, 11                Current drive model:
                                                                   0=none,
                                                                   1=Cohen,
-                                                                  11=Marushchenko.
+                                                                  2=No trapping
+                                                                  3=Neoclassical.
 
 `igrad`          Integer                0, 1                    Ray-tracing model:
                                                                   0=optical,