README: Show default filename example

1 files changed, 3 insertions, 3 deletions

diff --git a/README.md b/README.md
index 4ac1965..4dc4269 100644
--- a/README.md
+++ b/README.md
@@ -33,9 +33,9 @@ by setting the `w3m-session-backup-save-directory` variable:
 
 	(setq w3m-session-backup-save-directory "~/backups")
 
-TODO default
-The backup filename is generated by a function which can be replaced with a
-custom function. For example:
+The backup filename is generated by a function. By default, files will be named
+using the current date, like this: `w3m-tabs-20180411-22h42m08.yml`. A custom
+function can be used instead. For example:
 
 	(setq w3m-session-backup-filename-function
 	      (lambda ()