diff --git a/src/sctp_capabilities/capabilities.c b/src/sctp_capabilities/capabilities.c
new file mode 100644
index 0000000..8775760
--- /dev/null
+++ b/src/sctp_capabilities/capabilities.c
@@ -0,0 +1,53 @@
+#include "capabilities.h"
+#include <rawrtcdc/sctp_capabilities.h>
+#include <rawrtcc/code.h>
+#include <re.h>
+
+/**
+ * Print debug information for SCTP capabilities.
+ */
+int rawrtc_sctp_capabilities_debug(
+    struct re_printf* const pf, struct rawrtc_sctp_capabilities const* const capabilities) {
+    int err = 0;
+
+    // Check arguments
+    if (!capabilities) {
+        return 0;
+    }
+
+    err |= re_hprintf(pf, "  SCTP Capabilities <%p>:\n", capabilities);
+
+    // Maximum message size
+    err |= re_hprintf(pf, "    max_message_size=%" PRIu64 "\n", capabilities->max_message_size);
+
+    // Done
+    return err;
+}
+
+/*
+ * 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) {
+    struct rawrtc_sctp_capabilities* capabilities;
+
+    // Check arguments
+    if (!capabilitiesp) {
+        return RAWRTC_CODE_INVALID_ARGUMENT;
+    }
+
+    // Allocate capabilities
+    capabilities = mem_zalloc(sizeof(*capabilities), NULL);
+    if (!capabilities) {
+        return RAWRTC_CODE_NO_MEMORY;
+    }
+
+    // Set fields
+    capabilities->max_message_size = max_message_size;
+
+    // Set pointer & done
+    *capabilitiesp = capabilities;
+    return RAWRTC_CODE_SUCCESS;
+}