diff --git a/src/INSTALL b/src/INSTALL
index 55f0c5b..cc80df5 100644
--- a/src/INSTALL
+++ b/src/INSTALL
@@ -41,3 +41,8 @@ The first section is rather standard. The second section is not:
     wg-quick(8). If you don't use systemd, you certainly don't want this, and
     should set it to `no'. If systemd isn't auto-detected, but you still would
     like to install it, set this to `yes'.
+
+If you're a simple `make && make install` kind of user, you can get away with
+not setting these variables and relying on the auto-detection. However, if
+you're writing a package for a distro, you'll want to explicitly set these,
+depending on what you want.