diff --git a/include/rawrtcdc/sctp_capabilities.h b/include/rawrtcdc/sctp_capabilities.h
new file mode 100644
index 0000000..995382f
--- /dev/null
+++ b/include/rawrtcdc/sctp_capabilities.h
@@ -0,0 +1,32 @@
+#pragma once
+#include <rawrtcc/code.h>
+#include <re.h>
+
+/**
+ * SCTP capabilities.
+ */
+struct rawrtc_sctp_capabilities;
+
+/**
+ * Create a new SCTP transport capabilities instance.
+ * `*capabilitiesp` must be unreferenced.
+ */
+enum rawrtc_code rawrtc_sctp_capabilities_create(
+    struct rawrtc_sctp_capabilities** const capabilitiesp,  // de-referenced
+    uint64_t const max_message_size);
+
+/**
+ * Get the SCTP parameter's maximum message size value.
+ *
+ * Note: A value of `0` indicates that the implementation supports
+ *       receiving messages of arbitrary size.
+ */
+enum rawrtc_code rawrtc_sctp_capabilities_get_max_message_size(
+    uint64_t* const max_message_sizep,  // de-referenced
+    struct rawrtc_sctp_capabilities* const capabilities);
+
+/**
+ * Print debug information for SCTP capabilities.
+ */
+int rawrtc_sctp_capabilities_debug(
+    struct re_printf* const pf, struct rawrtc_sctp_capabilities const* const capabilities);