diff --git a/Setting up a Minecraft server.md b/Setting up a Minecraft server.md
index b6b49ce..b3292ce 100644
--- a/Setting up a Minecraft server.md	
+++ b/Setting up a Minecraft server.md	
@@ -38,6 +38,8 @@ cd /opt/minecraft
 # Go to https://www.minecraft.net/en-us/download/server,
 # and copy the link for "Download server.[version].jar:
 wget https://piston-data.mojang.com/v1/objects/84194a2f286ef7c14ed7ce0090dba59902951553/server.jar
+# If you get permisison denied errors, the filesystem permissions for /opt/minecraft are
+# not set correctly, check those with `ls -lah` and learn stuff
 ```
 
 # Starting the server
@@ -47,7 +49,7 @@ wget https://piston-data.mojang.com/v1/objects/84194a2f286ef7c14ed7ce0090dba5990
 # -Xms is the amount of memory your server will be allocated when it starts
 # these two take values in format of NUMBERUNIT, so 3G would be 3 gigabytes, 
 # 512M would be 512 megabytes
-java -jar -Xmx4G
+java -jar -XmX4g -Xms512M
 ```
 
 This enables minecraft to run in the background, restart if it crashes, etc etc.