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-rw-r--r--doc/ref/api-io.texi6
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/ref/api-io.texi b/doc/ref/api-io.texi
index dead52fe1..f0ea5c3d4 100644
--- a/doc/ref/api-io.texi
+++ b/doc/ref/api-io.texi
@@ -1007,6 +1007,12 @@ This section describes how to use Scheme ports from C.
@subsubheading Port basics
+@cindex ptob
+@tindex scm_ptob_descriptor
+@tindex scm_port
+@findex SCM_PTAB_ENTRY
+@findex SCM_PTOBNUM
+@vindex scm_ptobs
There are two main data structures. A port type object (ptob) is of
type @code{scm_ptob_descriptor}. A port instance is of type
@code{scm_port}. Given an @code{SCM} variable which points to a port,