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diff --git a/docs/users_guide/ffi-chap.xml b/docs/users_guide/ffi-chap.xml
index 7e2c547..5ef50a6 100644
--- a/docs/users_guide/ffi-chap.xml
+++ b/docs/users_guide/ffi-chap.xml
@@ -19,7 +19,7 @@ Foreign function interface (FFI)
The FFI libraries are documented in the accompanying library
documentation; see for example the
- Foreign module.
+ Foreign module.
GHC extensions to the FFI Addendum
@@ -63,6 +63,21 @@ OK:
+
+
+ Primitive imports
+
+ GHC extends the FFI with an additional calling convention
+ prim, e.g.:
+
+ foreign import prim "foo" foo :: ByteArray# -> (# Int#, Int# #)
+
+ This is used to import functions written in Cmm code that follow an
+ internal GHC calling convention. This feature is not intended for
+ use outside of the core libraries that come with GHC. For more
+ details see the GHC developer wiki.
+
+
@@ -483,7 +498,7 @@ int main(int argc, char *argv[])
threads, which are Haskell threads tied to a
particular OS thread. For information on bound threads, see
the documentation
- for the Control.Concurrent
+ for the Control.Concurrent
module.
@@ -548,7 +563,6 @@ int main(int argc, char *argv[])