diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..d300203
Binary files /dev/null and b/.DS_Store differ
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..7881938
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,2 @@
+language: c++
+compiler: make
diff --git a/Inventory.cpp b/Inventory.cpp
index 57964b4..a918693 100644
--- a/Inventory.cpp
+++ b/Inventory.cpp
@@ -14,7 +14,15 @@ Inventory::Inventory(string name, float price, int count)
 
 void Inventory::sell()
 {
-  m_in_stock--;
+  if(m_in_stock > 0)
+  {
+    m_in_stock--;
+  }
+  else
+  {
+    std::cout << "Sorry, that item is out of stock" << std::endl;
+  }
+
 }
 
 ostream& operator<<(ostream& stream, const Inventory& item)
diff --git a/Inventory.h b/Inventory.h
index c52d5d8..67a51ea 100644
--- a/Inventory.h
+++ b/Inventory.h
@@ -5,6 +5,18 @@
 using std::string;
 using std::ostream;
 
+/*
+Summary of class Inventory:
+Keeps track of an inventory item by name, including price and stock.
+
+String m_name: Name of the inventory item
+Float m_price: Price of the inventory item
+Int m_in_stock: Quantity of the inventory item
+
+Void sell() subtracts one from the stock quantity
+The item price can be be printed from outside of this class using <<InventoryInstance
+*/
+
 class Inventory
 {
   private:
diff --git a/readme.txt b/readme.txt
new file mode 100644
index 0000000..9fd12b4
--- /dev/null
+++ b/readme.txt
@@ -0,0 +1,7 @@
+Project Inventory
+
+Included files:
+Makefile
+main.cpp
+Inventory.h
+Inventory.cpp