diff --git a/app/main.c b/app/main.c
index a3c7811..f562ccf 100644
--- a/app/main.c
+++ b/app/main.c
@@ -34,6 +34,7 @@ int main(int argc, char *argv[])
 		return 1;
 	}
 
+	// Set up SDL window
 	int err = SDL_Init(SDL_INIT_VIDEO);
 	assert(0 == err);
 	window = SDL_CreateWindow(
@@ -43,6 +44,7 @@ int main(int argc, char *argv[])
 	renderer = SDL_CreateRenderer(window, -1, 0);
 	assert(NULL != renderer);
 
+	// Find chunk nodes in map XML
 	xmlDocPtr doc;
 	xmlNodePtr node;
 	assert(strlen(argv[1]) + strlen(MAP_ASSET) < MAX_PATH_LEN);
@@ -63,6 +65,7 @@ int main(int argc, char *argv[])
 		node = node->next;
 	assert(NULL != node);
 
+	// Iterate through chunks and populate map array.
 	xmlNodePtr chunk_contents;
 	for (node = node->xmlChildrenNode; NULL != node; node = node->next) {
 		if (0 != xmlStrcmp(node->name, (const xmlChar *)"chunk"))