diff --git a/INSTALL b/INSTALL
index e0c8309d4..e505bb5ea 100644
--- a/INSTALL
+++ b/INSTALL
@@ -65,6 +65,9 @@ be enabled by default.  The interaction with blocking I/O is pretty ad
 hoc at the moment.  In our experience, bugs in the thread support do
 not affect you if you don't actually use threads.
 
+At the moment, threads are known not to work with the NetBSD 1.2
+assembler.
+
 --enable-dynamic-linking --- Build a Guile executable and library
 providing Scheme functions which can load a shared library and
 initialize it, perhaps thereby adding new functions to Guile.  This