1 files changed, 27 insertions, 0 deletions
diff --git a/include/cru/common/io/OpenFileFlag.h b/include/cru/common/io/OpenFileFlag.h
index bca1d737..fd8b6e2c 100644
--- a/include/cru/common/io/OpenFileFlag.h
+++ b/include/cru/common/io/OpenFileFlag.h
@@ -9,11 +9,38 @@ struct OpenFileFlagTag {};
 using OpenFileFlag = Bitmask<details::OpenFileFlagTag>;
 
 struct OpenFileFlags {
+  /**
+   * \brief for reading
+   */
   static constexpr OpenFileFlag Read{0x1};
+
+  /**
+   * \brief for writing
+   */
   static constexpr OpenFileFlag Write{0x2};
+
+  /**
+   * \brief when writing, seek to end first
+   * Only effective for writing.
+   */
   static constexpr OpenFileFlag Append{0x4};
+
+  /**
+   * \brief when writing, truncate the file to empty
+   * Only effective for writing.
+   * So the content is erased! Be careful!
+   */
   static constexpr OpenFileFlag Truncate{0x8};
+
+  /**
+   * \brief when writing, if the file does not exist, create one
+   * Only effective for writing.
+   */
   static constexpr OpenFileFlag Create{0x10};
+
+  /**
+   *  TODO: ???
+   */
   static constexpr OpenFileFlag Exclusive{0x20};
 };
 }  // namespace cru::io