diff --git a/Customization.md b/Customization.md
index 52f5389..7938ca6 100644
--- a/Customization.md
+++ b/Customization.md
@@ -22,9 +22,9 @@ Stand-alone mode: index the entire project at `<root>` then exit.
 
 A JSON string `<json>` containing [initialization options](#initialization-options).
 
-#### `--log-file=<file>` / `--log-file-append=<file>`
+#### `--log-file=<file>` / `--log-file-append=<bool>`
 
-Write logging to `<file>` / append logging to `<file>`
+Write logging to `<file>` / whether to append logging to `<file>`
 
 #### `-v=<N>`