diff --git a/libsolidity/Types.h b/libsolidity/Types.h
index cea711991..e1852bc7f 100644
--- a/libsolidity/Types.h
+++ b/libsolidity/Types.h
@@ -513,7 +513,7 @@ public:
 	virtual Category getCategory() const override { return Category::Function; }
 
 	/// @returns TypePointer of a new FunctionType object. All input/return parameters are an appropriate external types of input/return parameters of current function.
-	/// Returns an empty shared pointer if one of input/return parameters does not have an externaltype.
+	/// Returns an empty shared pointer if one of the input/return parameters does not have an externaltype.
 	virtual TypePointer externalType() const override;
 
 	explicit FunctionType(FunctionDefinition const& _function, bool _isInternal = true);