diff --git a/docs/Project.toml b/docs/Project.toml
index 11db6657c..a0a756d2d 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -8,6 +8,9 @@ Literate = "98b081ad-f1c9-55d3-8b20-4c87d4299306"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
 
+[sources]
+ApproxFun = {path = ".."}
+
 [compat]
 BandedMatrices = "0.17, 1"
 Documenter = "1"