--- a/doc/Low-level-commands	Wed Feb 17 19:18:20 2021 +0000
+++ b/doc/Low-level-commands	Wed Feb 17 19:35:56 2021 +0000
@@ -80,7 +80,18 @@
 (or the first 256 bytes if the file is longer) and displays the read content in
 raw hex.
 
-savebin
+Just like with the low-level select command, there is no built-in MF/DF
+selection.
+
+savebin File_ID out-bin-file
+
+This command selects the specified EF (just like with low-level select and
+readef, you need to be in the right MF/DF directory) and saves its complete
+content in a raw binary file on the UNIX host file system.  This command
+supports all 3 types of EF (transparent, linear fixed and cyclic) and uses the
+correct READ BINARY or READ RECORD commands based on the SELECT response.
+Record-based EFs are read in the order of increasing record number and are saved
+in the host binary file with all records simply abutted together.
 
 Writing commands
 ================