diff --git a/docs/install.md b/docs/install.md
index 0e850e2545..d60ad0a707 100644
--- a/docs/install.md
+++ b/docs/install.md
@@ -269,7 +269,7 @@ In this instruction, we use [Caddy](https://caddyserver.com/) to make the Firefi
     WorkingDirectory=/home/firefish/firefish
     Environment="NODE_ENV=production"
     Environment="npm_config_cache=/tmp"
-		Environment="NODE_OPTIONS=--max-old-space-size=3072"
+    Environment="NODE_OPTIONS=--max-old-space-size=3072"
     # uncomment the following line if you use jemalloc (note that the path varies on different environments)
     # Environment="LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.2"
     StandardOutput=journal