diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1f8d9a5a..22a6a778 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,5 +1,5 @@
 set(so_library soprano)
-set(so_src so_md5.c so_password.c so_read.c so_beread.c so_feread.c)
+set(so_src so_md5.c so_password.c so_param.c so_read.c so_beread.c so_feread.c)
 
 add_library(so_library_shared SHARED ${so_src})
 set_target_properties(so_library_shared PROPERTIES OUTPUT_NAME ${so_library})
diff --git a/src/so_param.c b/src/so_param.c
new file mode 100644
index 00000000..a47b82e5
--- /dev/null
+++ b/src/so_param.c
@@ -0,0 +1,36 @@
+
+/*
+ * soprano.
+ *
+ * Protocol-level PostgreSQL client library.
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+
+#include <so_macro.h>
+#include <so_stream.h>
+#include <so_param.h>
+
+int so_paramlist_add(so_paramlist_t *list,
+                     uint8_t *name,
+                     uint32_t name_len,
+                     uint8_t *value,
+                     uint32_t value_len)
+{
+	int size = sizeof(so_param_t) + name_len + value_len;
+	int rc;
+	rc = so_stream_ensure(&list->buf, size);
+	if (so_unlikely(rc == -1))
+		return -1;
+	so_param_t *param = (so_param_t*)list->buf.p;
+	param->name_len = name_len;
+	param->value_len = value_len;
+	memcpy(param->data, name, name_len);
+	memcpy(param->data + name_len, value, value_len);
+	so_stream_advance(&list->buf, size);
+	return 0;
+}
diff --git a/src/so_param.h b/src/so_param.h
new file mode 100644
index 00000000..53a2036a
--- /dev/null
+++ b/src/so_param.h
@@ -0,0 +1,48 @@
+#ifndef SO_PARAM_H_
+#define SO_PARAM_H_
+
+/*
+ * soprano.
+ *
+ * Protocol-level PostgreSQL client library.
+*/
+
+typedef struct so_param_t     so_param_t;
+typedef struct so_paramlist_t so_paramlist_t;
+
+struct so_param_t {
+	uint32_t name_len;
+	uint32_t value_len;
+	char data[];
+};
+
+struct so_paramlist_t {
+	so_stream_t buf;
+};
+
+static inline char*
+so_param_name(so_param_t *param) {
+	return param->data;
+}
+
+static inline char*
+so_param_value(so_param_t *param) {
+	return param->data + param->name_len;
+}
+
+static inline void
+so_paramlist_init(so_paramlist_t *list)
+{
+	so_stream_init(&list->buf);
+}
+
+static inline void
+so_paramlist_free(so_paramlist_t *list)
+{
+	so_stream_free(&list->buf);
+}
+
+int so_paramlist_add(so_paramlist_t*, uint8_t*, uint32_t,
+                     uint8_t*, uint32_t);
+
+#endif