diff --git a/chapters/en/chapter12/4.mdx b/chapters/en/chapter12/4.mdx
index 769bb561c..4e440bd61 100644
--- a/chapters/en/chapter12/4.mdx
+++ b/chapters/en/chapter12/4.mdx
@@ -89,7 +89,7 @@ training_args = GRPOConfig(
     # Essential parameters
     output_dir="output",
     num_train_epochs=3,
-    num_generation=4,  # Number of completions to generate for each prompt
+    num_generations=4,  # Number of completions to generate for each prompt
     per_device_train_batch_size=4,  # We want to get all generations in one device batch
     # Optional but useful
     gradient_accumulation_steps=2,