diff --git a/prompt_engineering_interactive_tutorial/README.md b/prompt_engineering_interactive_tutorial/README.md
index d99c4d5..744d84d 100644
--- a/prompt_engineering_interactive_tutorial/README.md
+++ b/prompt_engineering_interactive_tutorial/README.md
@@ -18,7 +18,7 @@ This course is structured to allow you many chances to practice writing and trou
 
 Note: This tutorial uses our smallest, fastest, and cheapest model, Claude 3 Haiku. Anthropic has [two other models](https://docs.anthropic.com/claude/docs/models-overview), Claude 3 Sonnet and Claude 3 Opus, which are more intelligent than Haiku, with Opus being the most intelligent.
 
-*This tutorial also exists on [Google Sheets using Anthropic's Claude for Sheets extension](https://docs.google.com/spreadsheets/d/19jzLgRruG9kjUQNKtCg1ZjdD6l6weA6qRXG5zLIAhC8/edit?usp=sharing). We recommend using that version as it is more user friendly.*
+*This tutorial also exists on [Google Sheets using Anthropic's Claude for Sheets™ extension](https://docs.google.com/spreadsheets/d/19jzLgRruG9kjUQNKtCg1ZjdD6l6weA6qRXG5zLIAhC8/edit?usp=sharing). We recommend using that version as it is more user friendly.*
 
 When you are ready to begin, go to `01_Basic Prompt Structure` to proceed.
 
@@ -55,4 +55,4 @@ Each chapter consists of a lesson and a set of exercises.
 - **Appendix:** Beyond Standard Prompting
   - Chaining Prompts
   - Tool Use
-  - Search & Retrieval
\ No newline at end of file
+  - Search & Retrieval