diff --git a/presentation.md b/presentation.md
index 8534fef..1f7d399 100644
--- a/presentation.md
+++ b/presentation.md
@@ -1,7 +1,7 @@
 ---
 marp: true
-title: Declarative Distrbutions
-description: Declarative Distrbutions
+title: Declarative Distributions
+description: Declarative Distributions
 theme: uncover
 class:
     - invert
@@ -127,6 +127,13 @@ While we will try to talk about generalities of declarative operating system par
 
 ---
 
+### What is the store like?
+
+- Lots of files that look like {hash}-package-version
+- Hash is derived from a build dependency graph
+    - A program can use any version of a library it needs
+    - A program build hash is unique, if any dependency changes the hash will as well.
+
 ### Distro Profile
 
 - Guix `~/.guix-profile`
@@ -137,7 +144,7 @@ While we will try to talk about generalities of declarative operating system par
 
 ---
 
-- Store hold system and package files
+- Store holds system and package files
 - Profile links to those files
 
 ---
@@ -187,6 +194,14 @@ $ readlink /home/tylerm/.guix-home/profile/bin/gcc
 
 ---
 
-## test
+## What is a package?
 
-Test content in a slide
+- Since Nix and Scheme are functional, packages are immutable pure functions
+- They define everything from:
+    - Inputs
+    - Dependencies
+    - Expected Outputs
+    - Build environment
+- Builds are completely isolated from one another
+    - You cannot forget to define a dependency
+    - You can guarantee that package will build once you get it working