diff --git a/AlgebraicDataflowArchitectureModel/src/code/ast/Expression.java b/AlgebraicDataflowArchitectureModel/src/code/ast/Expression.java
index efa14f3..4cc080e 100644
--- a/AlgebraicDataflowArchitectureModel/src/code/ast/Expression.java
+++ b/AlgebraicDataflowArchitectureModel/src/code/ast/Expression.java
@@ -11,7 +11,7 @@
 	 *
 	 * @param variable   The variable to be replaced
 	 * @param expression The expression that {@code variable} is replaced to
-	 * @return A dupulicated expression that is replaced with a given {@code expression}
+	 * @return A duplicated expression that is replaced with a given {@code expression}
 	 * @implNote The instance of any member must be immutable
 	 * @apiNote All variables match to the given one will be replaced with the given {@code expression}
 	 */