diff --git a/src/common/algorithm.h b/src/common/algorithm.h
index 18e7ece98..e21b1373c 100644
--- a/src/common/algorithm.h
+++ b/src/common/algorithm.h
@@ -7,6 +7,11 @@
 #include <algorithm>
 #include <functional>
 
+// Algorithms that operate on iterators, much like the <algorithm> header.
+//
+// Note: If the algorithm is not general-purpose and/or doesn't operate on iterators,
+//       it should probably not be placed within this header.
+
 namespace Common {
 
 template <class ForwardIt, class T, class Compare = std::less<>>