diff --git a/exercises/25_motioncal_tbeam/README.md b/exercises/25_motioncal_tbeam/README.md
index 164c700..66a8997 100644
--- a/exercises/25_motioncal_tbeam/README.md
+++ b/exercises/25_motioncal_tbeam/README.md
@@ -5,6 +5,8 @@ Paul Stoffregen's MotionCal desktop tool.
 
 https://github.com/PaulStoffregen/MotionCal.git (fetch)
 
+See https://github.com/PaulStoffregen/MotionCal/issues/25 for Gentoo build tricks.
+
 MotionCal expects:
 
 ```text