diff --git a/Project.toml b/Project.toml
index 52e937998..bd1c14869 100644
--- a/Project.toml
+++ b/Project.toml
@@ -6,6 +6,7 @@ version = "4.25.1"
 [deps]
 Arrow = "69666777-d1a9-59fb-9406-91d4454c9d45"
 BSplineKit = "093aae92-e908-43d7-9660-e50ee39d5a0a"
+Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"
 DataAPI = "9a962f9c-6df0-11e9-0e5d-c546b8b5ee8a"
 Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
 GLM = "38e38edf-8417-5370-95a0-9cbb8c7f171a"
@@ -33,6 +34,7 @@ TypedTables = "9d95f2ec-7b3d-5a63-8d20-e2491e220bb9"
 Aqua = "0.8"
 Arrow = "1, 2"
 BSplineKit = "0.14, 0.15, 0.16, 0.17"
+Compat = "4.10"
 DataAPI = "1"
 DataFrames = "1"
 Distributions = "0.21, 0.22, 0.23, 0.24, 0.25"
diff --git a/src/MixedModels.jl b/src/MixedModels.jl
index 27037facc..84a825795 100644
--- a/src/MixedModels.jl
+++ b/src/MixedModels.jl
@@ -4,6 +4,7 @@ using Arrow: Arrow
 using Base: Ryu, require_one_based_indexing
 using BSplineKit: BSplineKit, BSplineOrder, Natural, Derivative, SplineInterpolation
 using BSplineKit: interpolate
+using Compat: @compat
 using DataAPI: DataAPI, levels, refpool, refarray, refvalue
 using Distributions: Distributions, Bernoulli, Binomial, Chisq, Distribution, Gamma
 using Distributions: InverseGaussian, Normal, Poisson, ccdf
@@ -160,6 +161,9 @@ export @formula,
 # TODO: move this to the correct spot in list once we've decided on name
 export savereplicates, restorereplicates
 
+@compat public rePCA, PCA
+
+
 """
     MixedModel