diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7533574..7012583 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -23,4 +23,10 @@ Use `./build_wasm.sh PATH_TO_INCLUDE_DIR` to build the WASM output, where `PATH_
 ```
 cmake .
 make
+```
+
+# Running command line
+
+```
+./font-maker --name "Noto Sans" output File1.ttf File2.ttf
 ```
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
index 5f28ee2..43cce79 100644
--- a/main.cpp
+++ b/main.cpp
@@ -7,6 +7,9 @@
 
 #ifndef EMSCRIPTEN
 #include "ghc/filesystem.hpp"
+
+// allow font filenames with commas
+#define CXXOPTS_VECTOR_DELIMITER '\0'
 #include "cxxopts.hpp"
 #endif
 #include <iostream>