diff --git a/src/input.c b/src/input.c
index d374da6..3912cb2 100644
--- a/src/input.c
+++ b/src/input.c
@@ -23,6 +23,7 @@ void input_step(Input *input) {
 }
 
 void input_init(Input *input) {
+	/* initialize all values to S_UP, avoid random bugs */
 	input->keys[K_LEFT] = KEY_LEFT;
 	input->keys[K_RIGHT] = KEY_RIGHT;
 	input->keys[K_UP] = KEY_UP;
@@ -34,6 +35,7 @@ void input_init(Input *input) {
 }
 
 void input_draw_debug(Input *input) {
+	/* debug function that draws all keys state */
 	for (int i = 0; i < KEYS_COUNT; ++i) {
 		dprint(0, i * 10, C_BLACK, "%d", i);
 		dprint(16, i * 10, C_BLACK, "%d", input->states[i]);