diff --git a/README.md b/README.md
index ed6ddca..8804993 100644
--- a/README.md
+++ b/README.md
@@ -435,11 +435,16 @@ the current game should be saved before, after or replace the selected game.
 
 There is a search field above the game list. If a string is entered in the
 search field, the game list is filtered to only show games matching the search
-string.
+string. The matching is case insensitive and by default matches a substring in
+the game list. It is possible to enable matching using [Java regular expression
+syntax](https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html)
+by enabling *Regular Expression Search* in the menu.
 
 **Hint!** In the game list, tap and hold a game to delete that game from the PGN
 file.
 
+**Hint!** To delete the whole file, select *Delete File* from the menu.
+
 ### FEN/EPD
 
 To load a position from a FEN/EPD file, go to *Left drawer menu* -> *File* ->