diff --git a/doc/recipes.service b/doc/recipes.service
index 8480fbd..2c6c91e 100644
--- a/doc/recipes.service
+++ b/doc/recipes.service
@@ -5,6 +5,8 @@ After=network.target
 [Service]
 Type=simple
 User=pi
+# Uncomment to use libjemalloc on Raspberry Pi. package 'libjemalloc' needs to be installed.
+# Environment="LD_PRELOAD=/usr/lib/aarch64-linux-gnu/libjemalloc.so.2"
 WorkingDirectory=/home/pi/recipes
 ExecStart=/home/pi/recipes/recipes
 Restart=always