diff --git a/doc/gitian-building.md b/doc/gitian-building.md
--- a/doc/gitian-building.md
+++ b/doc/gitian-building.md
@@ -105,6 +105,9 @@
 
 # Note the path to descriptors assumes vagrant was used.  These files are within the ABC repository normally.
 ./bin/gbuild --commit bitcoin=${COMMIT} --url bitcoin=${URL} /vagrant/contrib/gitian-descriptors/gitian-linux.yml
+# Note: If you plan on signing the binaries generated during this process, be
+# sure to copy them from ./build/out/ to /vagrant/gitian/<platform-name>
+# otherwise they will be overwritten by the next gbuild call.
 ./bin/gbuild --commit bitcoin=${COMMIT} --url bitcoin=${URL} /vagrant/contrib/gitian-descriptors/gitian-win.yml
 ./bin/gbuild --commit bitcoin=${COMMIT} --url bitcoin=${URL} /vagrant/contrib/gitian-descriptors/gitian-osx.yml
 ```