diff --git a/doc/SUMMARY.md b/doc/SUMMARY.md
index 48aa6580fd..5e0f22ae7a 100644
--- a/doc/SUMMARY.md
+++ b/doc/SUMMARY.md
@@ -46,7 +46,6 @@
   - [Task and Thread](./task.md)
 - [Functions](./functions.md)
 - [Tactics](./tactics.md)
-- [Foreign Function Interface](./ffi.md)
 
 # Other
 
@@ -64,6 +63,7 @@
   - [Windows MSYS2 Setup](./make/msys2.md)
   - [Windows with WSL](./make/wsl.md)
   - [Nix Setup (*Experimental*)](./make/nix.md)
+- [Foreign Function Interface](./dev/ffi.md)
 - [Unit Testing](./dev/testing.md)
 - [Building This Manual](./dev/mdbook.md)
 - [Fixing Tests](./dev/fixing_tests.md)
diff --git a/doc/ffi.md b/doc/dev/ffi.md
similarity index 100%
rename from doc/ffi.md
rename to doc/dev/ffi.md