diff --git a/CMakeLists.txt b/CMakeLists.txt
index 448c2fea..fe0c9500 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -145,6 +145,12 @@ execute_process(COMMAND git rev-parse --short HEAD
 if(NOT VERSION_HASH)
   set(VERSION_HASH "unknown")
 endif()
+
+# Provenance, printed by --version and at startup (port/src/main.c): a build
+# keeps pointing at this repository no matter who compiles or renames it.
+set(VERSION_CODENAME "larkspur")
+set(ORIGIN_URL "https://github.com/jkdansereau/goldeneye-pc-port")
+
 configure_file(
   "${CMAKE_SOURCE_DIR}/port/include/versioninfo.h.in"
   "${CMAKE_BINARY_DIR}/port/include/versioninfo.h" @ONLY)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 46a76632..a15b7689 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -32,6 +32,24 @@ keep the port faithful to the original game.
 - Port-layer code is plain C11 / C++17, SDL2 + OpenGL, no extra dependencies.
 - Keep commits focused and describe *why*, not just *what*.
 
+## Forks and derivative works
+
+Fork away — the code is MIT and the `port/` layer exists to be extended.
+Rebranding, localizing and extending are all welcome, and none of them need
+permission. If you carry the work forward under your own name, please keep
+two things:
+
+- **Attribution.** A clear statement, in your README and about page, that the
+  project derives from this one — with a link. The engine prints its origin at
+  startup and in its `--version` output; keeping that intact is part of the
+  ask.
+- **The record.** `docs/dev/` (the finding log, porting notes, per-level
+  status) is the engineering record behind every fix. Derivative projects are
+  asked to preserve or link to it rather than fork-and-forget.
+
+Stripping the attribution is the one thing that turns a fork into something
+we no longer recognize as a descendant of this project.
+
 ## Where to look
 
 - `docs/internals.md` — how the port is structured.
diff --git a/port/include/versioninfo.h.in b/port/include/versioninfo.h.in
index ea7f379b..a643387b 100644
--- a/port/include/versioninfo.h.in
+++ b/port/include/versioninfo.h.in
@@ -4,6 +4,8 @@
 /* Generated by CMake from versioninfo.h.in — do not edit. */
 
 #define GE007_VERSION_HASH  "@VERSION_HASH@"
+#define GE007_VERSION_CODENAME "@VERSION_CODENAME@"
+#define GE007_ORIGIN_URL "@ORIGIN_URL@"
 #define GE007_TARGET_PLATFORM "@TARGET_PLATFORM@"
 #define GE007_ROMID "@ROMID@"
 #define GE007_IS_PAL @VERSION_IS_PAL@
diff --git a/port/src/main.c b/port/src/main.c
index daa3ae76..e01b972e 100644
--- a/port/src/main.c
+++ b/port/src/main.c
@@ -54,8 +54,10 @@ static void portPrintVersion(void)
     printf("GoldenEye 007 PC port\n"
            "  rom      : %s\n"
            "  platform : %s\n"
-           "  build    : %s\n",
-           GE007_ROMID, GE007_TARGET_PLATFORM, GE007_VERSION_HASH);
+           "  build    : %s (%s)\n"
+           "  origin   : %s\n",
+           GE007_ROMID, GE007_TARGET_PLATFORM, GE007_VERSION_HASH,
+           GE007_VERSION_CODENAME, GE007_ORIGIN_URL);
 }
 
 static void portPrintHelp(const char *argv0)
@@ -95,7 +97,9 @@ int main(int argc, char **argv)
     }
 
     sysLogPrintf(LOG_INFO, "GoldenEye 007 PC port starting "
-                "(%s, %s)", GE007_ROMID, GE007_VERSION_HASH);
+                "(%s, %s %s) -- %s",
+                GE007_ROMID, GE007_VERSION_HASH, GE007_VERSION_CODENAME,
+                GE007_ORIGIN_URL);
 
     /* Crash handler first, so any failure below is debuggable. */
     crashInit();