diff --git a/README.md b/README.md
index 8282f7a..49ac498 100644
--- a/README.md
+++ b/README.md
@@ -95,6 +95,8 @@ To show GUI notifications (optional):
 ## Known problems
 
 - Awful documentation.
+- The ZFS ARC cache is memory-reclaimable, like the Linux buffer cache. However, in contrast to the buffer cache, it currently does not count to MemAvailable (see [openzfs/zfs#10255](https://github.com/openzfs/zfs/issues/10255)). See also https://github.com/rfjakob/earlyoom/pull/191.
+- Linux kernels with MuQSS CPU scheduler (linux-ck, linux-lxq, linux-zen etc) provide incorrect PSI metrics, see [issue](https://github.com/hakavlad/nohang/issues/25#issuecomment-596128524).
 
 ## nohang vs nohang-desktop