diff --git a/README.md b/README.md
index 85ca07a..6918cca 100644
--- a/README.md
+++ b/README.md
@@ -25,4 +25,8 @@ At the moment, an alpha version is undertaken, with these features:
 
 - Python 3.9 or higher
 - Enough disk space to hold the database
-- run `python builddb.py` to build the SQLite-database-file before running `python rep_cli.py`
\ No newline at end of file
+- run `python builddb.py` to build the SQLite-database-file before running `python rep_cli.py`
+
+## Known Bugs
+
+- Marking a piece as mastered the second time, the database won’t insert the entry and the program will crash
\ No newline at end of file