diff --git a/README.md b/README.md
index 2c9cd55..9377a2d 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,4 @@ Third party gradle packaging for gtsam
 
 ## Updating thirdparty library version
 
-Eigen is now a submodule here that we ask GTSAM to pull in using GTSAM_USE_SYSTEM_EIGEN. Change the submodule SHA to update Eigen.
+Eigen and GTSAM are pulled in via Cmake using fetch content. To update either, change the SHA or tag in [CMakeLists.txt](CMakeLists.txt).
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