diff --git a/.gitignore b/.gitignore
index 51fa643..46b1663 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 .idea/
-cmake-build-debug/*
+cmake-*/*
 cmake-build-debug-wsl/*
 build*/
 .vscode/
diff --git a/src/Function2D.h b/src/Function2D.h
index 3a3bbec..1429e95 100644
--- a/src/Function2D.h
+++ b/src/Function2D.h
@@ -148,6 +148,13 @@ namespace Aurora
 
     Matrix dot(const Matrix &aMatrix, const Matrix &aOther, FunctionDirection direction = Column);
 
+    /**
+     * 转换下标为索引值
+     * @attention 索引值按照其实为1与matlab对应，在C++中使用需要-1
+     * @param aVMatrixSize
+     * @param aSliceIdxs
+     * @return
+     */
     Matrix sub2ind(const Matrix &aVMatrixSize, std::initializer_list<Matrix> aSliceIdxs);
     
 };