diff --git a/Liquid-for-Programmers.md b/Liquid-for-Programmers.md
index f1373d2..13b747d 100644
--- a/Liquid-for-Programmers.md
+++ b/Liquid-for-Programmers.md
@@ -179,4 +179,10 @@ If you get errors like `A copy of ... has been removed from the module tree but
 ```ruby
 # in config/environments/development.rb and config/environments/test.rb
 Liquid.cache_classes = false
+```
+
+## Difference Between Assigns and Registers
+When you render a template, you can pass it assigns and registers.  The difference is subtle: assigns are exposed to the template, while registers are exposed to Drops, Tags, and Filters.
+```
+@template.render({}, registers: { user: @user })
 ```
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