diff --git a/docs/configuration/index.md b/docs/configuration/index.md
index 0ed00637..abcb78fa 100644
--- a/docs/configuration/index.md
+++ b/docs/configuration/index.md
@@ -112,7 +112,7 @@ This describes how to set up a mobile PaxCounter:<br> Follow all steps so far fo
 
 ## SD-card
 
-Data can be stored on SD-card if the board provides an SD card interface, either with SPI or MMC mode. To enable this feature, specify interface mode and hardware pins in board's hal file (`src/hal/<board.h\>`):
+Data can be stored on a FAT32 (pre-)formatted SD-card if the board provides an SD card interface, either with SPI or MMC mode. To enable this feature, specify interface mode and hardware pins in board's hal file (`src/hal/<board.h\>`):
 
 ```c
     #define HAS_SDCARD 1     // SD-card interface, using SPI mode
@@ -149,4 +149,4 @@ Additionally, it's possible to redirect system console output to a plain text fi
 
 ```c linenums="16" title="src/paxcounter_orig.conf"
 --8<-- "src/paxcounter_orig.conf:16:16"
-```
\ No newline at end of file
+```