docs: add note on example init file to PACKAGING.md

 PACKAGING.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/PACKAGING.md b/PACKAGING.md
index 9b4609f..270372e 100644
--- a/PACKAGING.md
+++ b/PACKAGING.md
@@ -104,6 +104,12 @@ install() {
 }
 ```
 
+## River specific suggestions
+
+I recommend installing the example init file found at `example/init` to
+`/usr/share/examples/river/init` or similar if your distribution has such
+a convention.
+
 ## Examples
 
 Build for the host architecture and libc ABI: