diff --git a/fs/ext2/Config.in b/fs/ext2/Config.in
index 19ed140c88..a1e3647a14 100644
--- a/fs/ext2/Config.in
+++ b/fs/ext2/Config.in
@@ -48,6 +48,8 @@ config BR2_TARGET_ROOTFS_EXT2_LABEL
 config BR2_TARGET_ROOTFS_EXT2_BLOCKS
 	int "exact size in blocks"
 	default 61440
+	help
+	  Specify the file system size as a number of 1024-byte blocks.
 
 config BR2_TARGET_ROOTFS_EXT2_INODES
 	int "exact number of inodes (leave at 0 for auto calculation)"