diff --git a/src/tsp.cpp b/src/tsp.cpp
index 944a678..cca9c71 100755
--- a/src/tsp.cpp
+++ b/src/tsp.cpp
@@ -20,6 +20,8 @@ int main(int argc, char *argv[]) {
 
     string filename = "tsp10.txt";
 #ifdef __APPLE__
+    // On macOS the resources are copeied to build/<release-target>/
+    // whilst, the running binary is under build/<release-target>/TSP.app/Contents/MacOS/
     filename.insert(0, "../../../");
 #endif