diff --git a/Makefile b/Makefile
index b4982ef..82439c7 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,9 @@
 SHELL = /bin/sh
 
 # Depending on the permissions of your TEXMF directory, you may need to
-# do a 'sudo make install'
+# do a 'sudo make install'. WARNING: any predefined TEXMF environment variables
+# probably won't be available under sudo! Be sure to pass them on the command
+# line if needed: e.g., 'make install TEXMFHOME=/usr/local/texmf'.
 
 # Set this to whatever it should be, e.g., /usr/local/texmf or whatever.
 # Probably better to install these in your own personal TEXMF tree so that