diff --git a/include/VersionedMap.h b/include/VersionedMap.h
index cabc71d..f9a17ab 100644
--- a/include/VersionedMap.h
+++ b/include/VersionedMap.h
@@ -33,7 +33,9 @@ namespace weaselab {
  *   - It's safe to operate on two different VersionedMaps in two different
  * threads concurrently
  *   - It's safe to have multiple threads operating on the same VersionedMap
- * concurrently if and only if all threads only call const methods.
+ * concurrently if all threads only call const methods.
+ *   - Methods that make stronger guarantees about the safety of calling
+ * concurrently with non-const methods are documented as such.
  */
 struct VersionedMap {