diff --git a/src/mapper/mapper.cc b/src/mapper/mapper.cc
index b74fbef..e5f20b6 100644
--- a/src/mapper/mapper.cc
+++ b/src/mapper/mapper.cc
@@ -8,13 +8,16 @@
 #include "draw.h"
 #include "game_mouse.h"
 #include "inventory.h"
+#include "mapper/mp_proto.h"
 #include "object.h"
 #include "proto.h"
+#include "settings.h"
 #include "svga.h"
 #include "window_manager.h"
 
 namespace fallout {
 
+static bool proto_user_is_librarian();
 static void redraw_toolname();
 static void clear_toolname();
 static void update_high_obj_name(Object* obj);
@@ -30,6 +33,17 @@ unsigned char* tool;
 // 0x6EC4AC
 int tool_win;
 
+// 0x487784
+bool proto_user_is_librarian()
+{
+    if (!settings.mapper.librarian) {
+        return false;
+    }
+
+    can_modify_protos = true;
+    return true;
+}
+
 // 0x48B16C
 void print_toolbar_name(int object_type)
 {
diff --git a/src/mapper/mp_proto.cc b/src/mapper/mp_proto.cc
new file mode 100644
index 0000000..3e89993
--- /dev/null
+++ b/src/mapper/mp_proto.cc
@@ -0,0 +1,8 @@
+#include "mapper/mp_proto.h"
+
+namespace fallout {
+
+// 0x559C60
+bool can_modify_protos = false;
+
+} // namespace fallout
diff --git a/src/mapper/mp_proto.h b/src/mapper/mp_proto.h
new file mode 100644
index 0000000..2bf6e8d
--- /dev/null
+++ b/src/mapper/mp_proto.h
@@ -0,0 +1,10 @@
+#ifndef FALLOUT_MAPPER_MP_PROTO_H_
+#define FALLOUT_MAPPER_MP_PROTO_H_
+
+namespace fallout {
+
+extern bool can_modify_protos;
+
+} // namespace fallout
+
+#endif /* FALLOUT_MAPPER_MP_PROTO_H_ */