diff --git a/presentation.md b/presentation.md
index 2d53372..8534fef 100644
--- a/presentation.md
+++ b/presentation.md
@@ -35,6 +35,15 @@ While we will try to talk about generalities of declarative operating system par
 
 ---
 
+# Declarative v. Imperative
+
+- Most distros are imperative
+    - You give them commands to get a result
+- Nix and Guix are declarative
+    - You define a wanted end state and Guix/Nix gets you there its way
+
+---
+
 # Reproducible
 
 - Systems have a given configuration
@@ -76,6 +85,7 @@ While we will try to talk about generalities of declarative operating system par
 - Nix package manager (nix)
 - Nix language
 - Systemd
+- Wrote like an entire research paper on the theory behind Nix
 
 ![bg left 40%](nix.png)
 
@@ -162,6 +172,7 @@ $ readlink /home/tylerm/.guix-home/profile/bin/gcc
 
 - Package manager takes in user and system configuration
 - Downloads needed data into store
+    - Prebuilt, signed binaries are called "substitutes"
 - Build any needed packages
 - Symlinks the user and system profiles
 
@@ -173,3 +184,9 @@ $ readlink /home/tylerm/.guix-home/profile/bin/gcc
 - Uses contained environment
 - `guix shell <package>`
 - `nix shell -p <package>`
+
+---
+
+## test
+
+Test content in a slide