diff --git a/KNOWN_BUGS.markdown b/KNOWN_BUGS.markdown
index 093d1cc..88ba793 100644
--- a/KNOWN_BUGS.markdown
+++ b/KNOWN_BUGS.markdown
@@ -4,7 +4,12 @@ KNOWN BUGS in xen-tools
 Bugs to fix before next release
 -------------------------------
 
-[None so far]
+* Older versions of LVM don't understand `--yes` while newer versions
+  require it. The fix for the latter
+  ([Debian bug report 754517](https://bugs.debian.org/754517))
+  introduced a regression with older LVM versions, e.g. on Debian 7
+  Wheezy. There's likely an LVM version check and an according switch
+  necessary.
 
 Bugs to fix rather soon
 -----------------------