diff --git a/tools/binman/README.entries b/tools/binman/README.entries
index 999b776..7cca030 100644
--- a/tools/binman/README.entries
+++ b/tools/binman/README.entries
@@ -302,6 +302,7 @@
     - files-compress: Compression algorithm to use:
         none: No compression
         lz4: Use lz4 compression (via 'lz4' command-line utility)
+    - files-align: Align each file to the given alignment
 
 This entry reads a number of files and places each in a separate sub-entry
 within this entry. To access these you need to enable device-tree updates