diff --git a/README.md b/README.md
index 133bdf9..a433d0f 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
 # fdup
 
+> [!CAUTION]
+> Recently I've noticed wrong hashsum calculations in some cases (unknown reason for now).
+>
+> Different files may be falsely marked as having the same hash! Be careful and do not use the `-remove` option until issue https://github.com/gechandesu/fdup/issues/1 is resolved.
+
 The dumb tool for finding duplicate files by their hash sums.
 
 Compile it with `-prod` for better performance: