diff --git a/chapters/en/chapter1/4.mdx b/chapters/en/chapter1/4.mdx
index 3870b541f..30a8610a9 100644
--- a/chapters/en/chapter1/4.mdx
+++ b/chapters/en/chapter1/4.mdx
@@ -34,7 +34,7 @@ The [Transformer architecture](https://arxiv.org/abs/1706.03762) was introduced
 
 - **May 2020**, [GPT-3](https://huggingface.co/papers/2005.14165), an even bigger version of GPT-2 that is able to perform well on a variety of tasks without the need for fine-tuning (called _zero-shot learning_)
 
-- **January 2022**: [InstructGPT](https://huggingface.co/papers/2203.02155), a version of GPT-3 that was trained to follow instructions better
+- **January 2022**: [InstructGPT](https://huggingface.co/papers/2203.02155), a version of GPT-3 that was trained to follow instructions better.
 This list is far from comprehensive, and is just meant to highlight a few of the different kinds of Transformer models. Broadly, they can be grouped into three categories:
 
 - **January 2023**: [Llama](https://huggingface.co/papers/2302.13971), a large language model that is able to generate text in a variety of languages.