diff --git a/.gitignore b/.gitignore
index 6b69ddff..b06d404c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -67,6 +67,7 @@ extern/*
 !extern/vk-bootstrap
 !extern/vk_mem_alloc.h
 !extern/lua-5.1.5
+!extern/VERSIONS.md
 
 # ImGui state
 imgui.ini
diff --git a/extern/VERSIONS.md b/extern/VERSIONS.md
new file mode 100644
index 00000000..1d7d2d4b
--- /dev/null
+++ b/extern/VERSIONS.md
@@ -0,0 +1,14 @@
+# Vendored Library Versions
+
+Versions of third-party libraries vendored in `extern/`. Update this file
+when upgrading any dependency so maintainers can track drift.
+
+| Library | Version | Source | Notes |
+|---------|---------|--------|-------|
+| Dear ImGui | 1.92.6 WIP | https://github.com/ocornut/imgui | Git submodule |
+| vk-bootstrap | latest | https://github.com/charles-lunarg/vk-bootstrap | Git submodule |
+| Vulkan Memory Allocator | 3.4.0 | https://github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator | Single header |
+| miniaudio | 0.11.24 | https://miniaud.io/ | Single header |
+| stb_image | 2.30 | https://github.com/nothings/stb | Single header |
+| stb_image_write | 1.16 | https://github.com/nothings/stb | Single header |
+| Lua | 5.1.5 | https://www.lua.org/ | Intentionally 5.1 for WoW addon API compatibility |