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-rw-r--r--r_qtl/r_qtl2.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/r_qtl/r_qtl2.py b/r_qtl/r_qtl2.py
index 5b926d1..c6307f5 100644
--- a/r_qtl/r_qtl2.py
+++ b/r_qtl/r_qtl2.py
@@ -566,7 +566,7 @@ def read_text_file(filepath: Union[str, Path]) -> Iterator[str]:
 
 def read_csv_file(filepath: Union[str, Path],
                   separator: str = ",",
-                  comment_char: str = "#") -> Iterator[str]:
+                  comment_char: str = "#") -> Iterator[tuple[str, ...]]:
     """Read a file as a csv file."""
     for line in read_text_file(filepath):
         if line.startswith(comment_char):