diff --git a/.gitignore b/.gitignore
index bd8dff2..ba38c30 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,7 @@
+# Configs and keys
+ch07/02_dataset-utilities/config.json
+ch07/03_model-evaluation/config.json
+
 # Graphics
 appendix-D/01_main-chapter-code/1.pdf
 appendix-D/01_main-chapter-code/2.pdf
diff --git a/ch07/02_dataset-utilities/config.json b/ch07/02_dataset-utilities/config.json
index 3f41b84..c0bdf62 100644
--- a/ch07/02_dataset-utilities/config.json
+++ b/ch07/02_dataset-utilities/config.json
@@ -1,3 +1,4 @@
 {
-    "OPENAI_API_KEY": "sk-..."
+    "OPENAI_API_KEY": "sk-...",
+    "_comment": "Enter your API key from https://platform.openai.com/api-keys"
 }
\ No newline at end of file
diff --git a/ch07/03_model-evaluation/config.json b/ch07/03_model-evaluation/config.json
index 3f41b84..c0bdf62 100644
--- a/ch07/03_model-evaluation/config.json
+++ b/ch07/03_model-evaluation/config.json
@@ -1,3 +1,4 @@
 {
-    "OPENAI_API_KEY": "sk-..."
+    "OPENAI_API_KEY": "sk-...",
+    "_comment": "Enter your API key from https://platform.openai.com/api-keys"
 }
\ No newline at end of file