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-rw-r--r--doc/ref/api-foreign.texi2
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/ref/api-foreign.texi b/doc/ref/api-foreign.texi
index f8ed4ccd7..2473870d3 100644
--- a/doc/ref/api-foreign.texi
+++ b/doc/ref/api-foreign.texi
@@ -489,6 +489,8 @@ platform-dependent size:
@defvrx {Scheme Variable} long
@defvrx {Scheme Variable} unsigned-long
@defvrx {Scheme Variable} size_t
+@defvrx {Scheme Variable} ssize_t
+@defvrx {Scheme Variable} ptrdiff_t
Values exported by the @code{(system foreign)} module, representing C
numeric types. For example, @code{long} may be @code{equal?} to
@code{int64} on a 64-bit platform.