manual: threads library require unix

1 files changed, 2 insertions, 2 deletions

diff --git a/manual/src/library/libthreads.etex b/manual/src/library/libthreads.etex
index 50173a21e2..e05a44690e 100644
--- a/manual/src/library/libthreads.etex
+++ b/manual/src/library/libthreads.etex
@@ -20,8 +20,8 @@ overlapping I/O operations.
 
 Programs that use threads must be linked as follows:
 \begin{alltt}
-        ocamlc -I +threads \var{other options} unix.cma threads.cma \var{other files}
-        ocamlopt -I +threads \var{other options} unix.cmxa threads.cmxa \var{other files}
+        ocamlc -I +unix -I +threads \var{other options} unix.cma threads.cma \var{other files}
+        ocamlopt -I +unix -I +threads \var{other options} unix.cmxa threads.cmxa \var{other files}
 \end{alltt}
 Compilation units that use the "threads" library must also be compiled with
 the "-I +threads" option (see chapter~\ref{c:camlc}).