diff --git a/setif.h b/setif.h
new file mode 100644
index 0000000..7f83f73
--- /dev/null
+++ b/setif.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2012 Daniel Drown
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * setif.h - network interface configuration
+ */
+#ifndef __SETIF_H__
+#define __SETIF_H__
+
+int add_address(const char *ifname, int family, const void *address, int cidr, const void *broadcast);
+int if_up(const char *ifname, int mtu);
+
+#endif