diff --git a/README.md b/README.md
index 8ac88a2..b6fce54 100644
--- a/README.md
+++ b/README.md
@@ -10,3 +10,18 @@
 
 To full clean the repository again run `./bootstrap.sh clean`.
 ```
+
+## D-Bus bus names
+
+```
+To enable the use of Linux features like cgroups prioritization and
+udev/systemd control, one instance of phosphor-hwmon is intended to
+be run per hwmon sysfs class instance.
+
+This requires an algorithm for selecting a stable, well-known D-Bus busname.
+
+The algorithm is <PREFIX>-<ID>.Hwmon<N> where PREFIX is an autoconf
+configurable prefix (BUSNAME_PREFIX, xyz.openbmc_project by default),
+ID is a std::hash of the /sys/devices path backing the hwmon class
+instance, and N is the implemented phosphor-hwmon D-Bus API version.
+```
diff --git a/mainloop.cpp b/mainloop.cpp
index bf2cacc..61de673 100644
--- a/mainloop.cpp
+++ b/mainloop.cpp
@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#include <functional>
 #include <iostream>
 #include <memory>
 #include <cstdlib>
@@ -373,8 +374,10 @@
 
     {
         std::string busname{_prefix};
-        busname.append(1, '.');
-        busname.append(_instance);
+        busname.append(1, '-');
+        busname.append(
+                std::to_string(std::hash<decltype(_devPath)>{}(_devPath)));
+        busname.append(".Hwmon1");
         _bus.request_name(busname.c_str());
     }