--- a/doc/Low-level-commands	Sat Mar 06 22:55:21 2021 +0000
+++ b/doc/Low-level-commands	Sat Mar 06 23:13:28 2021 +0000
@@ -136,6 +136,15 @@
 on the SELECT response.  Cyclic files are restored by writing every record in
 the reverse order from the last index to the first.
 
+erase-file File_ID [fill-byte]
+
+This command erases the specified EF by overwriting its content with the
+specified fill byte, which defaults to 0xFF if the second argument is omitted.
+All 3 EF types (transparent, linear fixed and cyclic) are supported: for
+transparent EFs fc-simtool issues as many UPDATE BINARY commands as needed to
+overwrite the whole file, whereas for record-based EFs every record is
+overwritten with UPDATE RECORD.
+
 INVALIDATE and REHABILITATE
 ===========================