1 files changed, 2 insertions, 0 deletions

diff --git a/doc/ext_ffi_semantics.html b/doc/ext_ffi_semantics.html
index 889d44d8..f65fe8f3 100644
--- a/doc/ext_ffi_semantics.html
+++ b/doc/ext_ffi_semantics.html
@@ -185,6 +185,8 @@ a <tt>typedef</tt>, except re-declarations will be ignored):
 <tt>uint16_t</tt>, <tt>uint32_t</tt>, <tt>uint64_t</tt>,
 <tt>intptr_t</tt>, <tt>uintptr_t</tt>.</li>
 
+<li>From <tt>&lt;unistd.h&gt;</tt> (POSIX): <tt>ssize_t</tt>.</li>
+
 </ul>
 <p>
 You're encouraged to use these types in preference to