Clarification.
diff --git a/FAQ b/FAQ
index a34ccb5..58650cf 100644
--- a/FAQ
+++ b/FAQ
@@ -79,9 +79,11 @@
* Is OpenSSL thread-safe?
-Yes. On Windows and many Unix systems, OpenSSL automatically uses the
-multi-threaded versions of the standard libraries. If your platform
-is not one of these, consult the INSTALL file.
+Yes (with limitations: an SSL connection may not concurrently be used
+by multiple threads). On Windows and many Unix systems, OpenSSL
+automatically uses the multi-threaded versions of the standard
+libraries. If your platform is not one of these, consult the INSTALL
+file.
Multi-threaded applications must provide two callback functions to
OpenSSL. This is described in the threads(3) manpage.
