diff --git a/csst_ms_mbi_img_L1_fits.md b/csst_ms_mbi_img_L1_fits.md
index 651f0c91ca8ebb939618e444ebead6a3f1f1a3e5..e1c573a0f0ffd2a066e161f7630227ed4c208d8c 100644
--- a/csst_ms_mbi_img_L1_fits.md
+++ b/csst_ms_mbi_img_L1_fits.md
@@ -14,6 +14,8 @@
 ## HDU1
 
 ### Header of instrument
+| keyword   | value                     | comment                       | fallback_value | type | module                  |
+|-----------|:--------------------------|-------------------------------|----------------|------|-------------------------|
 
 ### Header of distortion
 
@@ -46,4 +48,11 @@
 
 ### Header of position calibration
 
+| keyword   | value                     | comment                       | fallback_value | type | module                  |
+|-----------|:--------------------------|-------------------------------|----------------|------|-------------------------|
+
 ### Header of flux calibration
+
+| keyword   | value                     | comment                       | fallback_value | type | module                  |
+|-----------|:--------------------------|-------------------------------|----------------|------|-------------------------|
+