diff --git a/README.md b/README.md
index cdb3b04..62cc594 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,8 @@ sudo make install
 - `SERVICEDIR_SYSTEMD=<PATH>`: The path to put the systemd user service file. Unused, if `SYSTEMD=0`. (Default: detected via `pkg-config`)
 - `SERVICEDIR_DBUS=<PATH>`: The path to put the dbus service file. (Default: detected via `pkg-config`)
 
+**Make sure to run all make calls with the same parameter set. So when building with `make PREFIX=/usr`, you have to install it with `make PREFIX=/usr install`, too.**
+
 Checkout the [wiki][wiki] for more information.
 
 ## Bug reports