diff --git a/src/core/pipropertystorage.cpp b/src/core/pipropertystorage.cpp
index 765a8ee1..351e4f8f 100644
--- a/src/core/pipropertystorage.cpp
+++ b/src/core/pipropertystorage.cpp
@@ -95,3 +95,20 @@ void PIPropertyStorage::setPropertyFlags(const PIString & name, int flags) {
 			return;
 		}
 }
+
+
+PIPropertyStorage::Property & PIPropertyStorage::operator[](const PIString & name) {
+	piForeach (Property & p, props)
+		if (p.name == name)
+			return p;
+	addProperty(name, "");
+	return props.back();
+}
+
+
+const PIPropertyStorage::Property PIPropertyStorage::operator[](const PIString & name) const {
+	piForeachC (Property & p, props)
+		if (p.name == name)
+			return p;
+	return Property();
+}
diff --git a/src/core/pipropertystorage.h b/src/core/pipropertystorage.h
index 37f0b76d..03b07951 100644
--- a/src/core/pipropertystorage.h
+++ b/src/core/pipropertystorage.h
@@ -60,6 +60,8 @@ public:
 	PIPropertyStorage & operator <<(const PIPropertyStorage & p) {props << p.props; return *this;}
 	Property & operator[](int i) {return props[i];}
 	const Property & operator[](int i) const {return props[i];}
+	Property & operator[](const PIString & name);
+	const Property operator[](const PIString & name) const;
 
 	static Property parsePropertyLine(PIString l);