diff --git a/substrate/node/runtime/src/lib.rs b/substrate/node/runtime/src/lib.rs
index 5bc730ef1b..fd1b13fdd0 100644
--- a/substrate/node/runtime/src/lib.rs
+++ b/substrate/node/runtime/src/lib.rs
@@ -63,6 +63,9 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	spec_name: create_runtime_str!("node"),
 	impl_name: create_runtime_str!("substrate-node"),
 	authoring_version: 10,
+	// Per convention: if the runtime behavior changes, increment spec_version and set impl_version
+	// to equal spec_version. If only runtime implementation changes and behavior does not, then
+	// leave spec_version as is and increment impl_version.
 	spec_version: 101,
 	impl_version: 101,
 	apis: RUNTIME_API_VERSIONS,