diff --git a/libs/sir/include/psemek/sir/stream.hpp b/libs/sir/include/psemek/sir/stream.hpp
index 28c8e226..386a6d96 100644
--- a/libs/sir/include/psemek/sir/stream.hpp
+++ b/libs/sir/include/psemek/sir/stream.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <psemek/io/stream.hpp>
+#include <psemek/util/any_set.hpp>
 
 namespace psemek::sir
 {
@@ -58,9 +59,12 @@ namespace psemek::sir
 
 		std::size_t offset() const { return offset_; }
 
+		util::any_set & context() { return context_; }
+
 	private:
 		io::istream & s_;
 		std::size_t offset_ = 0;
+		util::any_set context_;
 	};
 
 	struct ostream
@@ -81,9 +85,12 @@ namespace psemek::sir
 
 		std::size_t offset() const { return offset_; }
 
+		util::any_set & context() { return context_; }
+
 	private:
 		io::ostream & s_;
 		std::size_t offset_ = 0;
+		util::any_set context_;
 	};
 
 	struct null_istream