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-rw-r--r--lib/efi_loader/efi_file.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/efi_loader/efi_file.c b/lib/efi_loader/efi_file.c
index c96a7f7ca3..8b9fa5885a 100644
--- a/lib/efi_loader/efi_file.c
+++ b/lib/efi_loader/efi_file.c
@@ -1098,6 +1098,15 @@ static const struct efi_file_handle efi_file_handle_protocol = {
/**
* efi_file_from_path() - open file via device path
*
+ * The device path @fp consists of the device path of the handle with the
+ * simple file system protocol and one or more file path device path nodes.
+ * The concatenation of all file path names provides the total file path.
+ *
+ * The code starts at the first file path node and tries to open that file or
+ * directory. If there is a succeding file path node, the code opens it relative
+ * to this directory and continues iterating until reaching the last file path
+ * node.
+ *
* @fp: device path
* Return: EFI_FILE_PROTOCOL for the file or NULL
*/