diff --git a/docs/make.jl b/docs/make.jl
index 1022284..7b31142 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -1,4 +1,5 @@
 using JSOSuite
+using ExpressionTreeForge # added to include docstring of extra function
 using Documenter
 
 DocMeta.setdocmeta!(JSOSuite, :DocTestSetup, :(using JSOSuite); recursive = true)