diff --git a/4/README.md b/4/README.md
index 3939bb2..5e5d816 100644
--- a/4/README.md
+++ b/4/README.md
@@ -3,7 +3,7 @@
 
 Today's language: **gnu x86-64** (and alternatively **C**)
 
-Today I wanted to use OpenAI to solve the tasks using *gnu* **x86-64 assembly**, which I have never used before 
+Today I wanted to use ChatGPT to solve the tasks using *gnu* **x86-64 assembly**, which I have never used before 
 (I did some small things in [6502-asssembly](https://github.com/MatthiasQuintern/6502), so it wasn't all new).
 The prompt can be seen in `prompt.md`, the original file in `day4-by-ai.s`.
 It did a lot of things right, however it also did a lot of things wrong:
diff --git a/README.md b/README.md
index 1c33bcc..297e10f 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ The directories for each day contain my input file, my code and a README that sh
 
 ## Recommended Days
 These are the days with to most interesting code so far:
-1. **day 4**: *x86-64 assembly* with the help of OpenAI
+1. **day 4**: *x86-64 assembly* with the help of ChatGPT
 2. **day 6**: *html+javascript* [check it out here](https://quintern.xyz/advent22/day6.html)
 3. **day 7**: *awk+bash*