docs: the daemon deploy snippet carries --spm dnf

README.md

@@ -109,8 +109,9 @@ their own checkouts — no Dockerfiles outside the repos:
 spry deploy --verbose \
     --repository https://packages.astrologue.nz/repo/web-stack/repo.usmr
 
-# the daemon (from ../saddle — usm manifest deploy directly):
-cd ../saddle && usm manifest deploy \
+# the daemon (from ../saddle — usm manifest deploy directly; --spm dnf
+# is required for the in-container manage dependencies):
+cd ../saddle && usm manifest deploy --spm dnf \
     --repository https://packages.astrologue.nz/repo/web-stack/repo.usmr
 ```