1 files changed, 1 insertions, 0 deletions
diff --git a/src/nodes.h b/src/nodes.h
index 3a99474..a59f4a5 100644
--- a/src/nodes.h
+++ b/src/nodes.h
@@ -39,6 +39,7 @@ class OperatorNode: public Node {
 class OperandNode: public Node {
 	public:
 		explicit OperandNode(double);
+		explicit OperandNode(std::string);
 
 		virtual double solve();
 		virtual NodeType getType();