diff --git a/deps/DataInterface.py b/deps/DataInterface.py
index c7aaa6eb36aadd5d0e1f3241bf9c82599d4213b7..e68a942e8eb4e6cc9d9582a96ef20c9c65147b2a 100644
--- a/deps/DataInterface.py
+++ b/deps/DataInterface.py
@@ -517,7 +517,7 @@ class DataInterface:
         `_selectFiles`: default read all files, currently not in use
         
         return a dictionary contains:
-        `VHeader`: list, vertial header
+        `VHeader`: list, vertical header
         `HHeader`: list, horizontal header
         `Rows`: list[list], statistic data
         '''
@@ -590,7 +590,7 @@ class DataInterface:
         `_selectFiles`: default read all files, currently not in use
         
         return a dictionary contains:
-        `VHeader`: list, vertial header
+        `VHeader`: list, vertical header
         `Rows`: 2D list, element = (data, bin_num, isHBIN)
         `maxLen`: maximum column length
         '''
@@ -648,7 +648,7 @@ class DataInterface:
         `selectSites`: list of selected STDF sites
         
         return a dictionary contains:
-        `VHeader`: list, vertial header
+        `VHeader`: list, vertical header
         `Rows`: 2D list, element = (data, bin_num, isHBIN)
         `maxLen`: maximum column length
         '''