2 files changed, 4 insertions, 4 deletions
diff --git a/stack.c b/stack.c
index d13749e..d1e9b24 100644
--- a/stack.c
+++ b/stack.c
@@ -12,14 +12,13 @@ PositionStack ps_new(void) {
     return ps;
 }
 
-int ps_push(PositionStack *ps, Position pos) {
+void ps_push(PositionStack *ps, Position pos) {
     if (ps->top >= ps->capacity) {
         ps->capacity *= STACK_SIZE_COEFFICIENT;
         if ((ps->arr = realloc(ps->arr, sizeof(Position) * ps->capacity)) == NULL) error("Failed to realloc ps->arr\n");
     }
     ps->arr[ps->top] = pos;
     ps->top += 1;
-    return 0;
 }
 
 Position ps_pop(PositionStack *ps) {
diff --git a/stack.h b/stack.h
index 2105c7c..4fd7747 100644
--- a/stack.h
+++ b/stack.h
@@ -10,12 +10,13 @@
 struct PositionStack_s {
     Position *arr; /* The array with all the values */
     size_t capacity;
-    size_t top; /* Shows where the top of the stack is */
+    size_t top; /* Shows where the top of the stack is.
+                 * Points to the empty spot after the last element */
 };
 typedef struct PositionStack_s PositionStack;
 
 PositionStack ps_new(void); /* Returns an empty position stack */
-int ps_push(PositionStack *ps, Position pos); /* Returns -1 if failed to realloc() */
+void ps_push(PositionStack *ps, Position pos); /* Returns -1 if failed to realloc() */
 Position ps_pop(PositionStack *ps);
 Position ps_peek(PositionStack ps);
 void ps_free(PositionStack ps);