diff --git a/pr_agent/settings/pr_description_prompts.toml b/pr_agent/settings/pr_description_prompts.toml
index 7d2b06ea..6f822a7f 100644
--- a/pr_agent/settings/pr_description_prompts.toml
+++ b/pr_agent/settings/pr_description_prompts.toml
@@ -81,7 +81,7 @@ pr_files:
 {%- endif %}
 {%- if enable_pr_diagram %}
   changes_diagram: |
-    ```mermaind
+    ```mermaid
     ...
     ```
 {%- endif %}
@@ -168,7 +168,7 @@ pr_files:
 {%- endif %}
 {%- if enable_pr_diagram %}
   changes_diagram: |
-    ```mermaind
+    ```mermaid
     ...
     ```
 {%- endif %}