diff --git a/src/tracker/Tracker.jl b/src/tracker/Tracker.jl
index 94f9a94c..e99bc1cd 100644
--- a/src/tracker/Tracker.jl
+++ b/src/tracker/Tracker.jl
@@ -68,9 +68,9 @@ end
 
 include("idset.jl")
 include("back.jl")
-include("scalar.jl")
-include("array.jl")
 include("numeric.jl")
+include("lib/real.jl")
+include("lib/array.jl")
 
 """
     hook(f, x) -> x′
diff --git a/src/tracker/array.jl b/src/tracker/lib/array.jl
similarity index 100%
rename from src/tracker/array.jl
rename to src/tracker/lib/array.jl
diff --git a/src/tracker/scalar.jl b/src/tracker/lib/real.jl
similarity index 100%
rename from src/tracker/scalar.jl
rename to src/tracker/lib/real.jl