1 files changed, 10 insertions, 2 deletions
diff --git a/src/01/01b/stack.h b/src/01/01b/stack.h
index 7ccc173..752f865 100644
--- a/src/01/01b/stack.h
+++ b/src/01/01b/stack.h
@@ -1,3 +1,6 @@
+/**
+ * A singly linked list node node
+ */
 struct node {
   int data;
   struct node *next;
@@ -5,17 +8,22 @@ struct node {
 
 typedef struct node Node;
 
+/**
+ * A queue
+ */
 typedef struct {
   Node *head;
   int size;
 } Queue;
 
+/**
+ * A stack
+ */
 typedef struct {
   Queue *q1;
 } Stack;
 
-
-Stack *initialize();
+Stack *initialize(void);
 void push(Stack *stack, int data);
 int pop(Stack *stack);
 int size(Stack *stack);