When writing a code review suggestion on GitHub, the suggestion block normally opens with a triple-backtick fence:
```suggestion
...
```
If the code you are suggesting itself contains triple backticks (e.g. a Markdown snippet), the inner fences break the outer suggestion block. The fix is to use triple tildes for the outer fence instead:
~~~suggestion
```bash
echo "hello"
```
~~~
GitHub's Markdown parser treats ~~~ and ``` as equivalent fencing delimiters, so ~~~suggestion is recognised as a valid suggestion block while leaving any inner triple-backtick fences unambiguous.