give an explaination behind this shellcheck code.

SC2250.md

@@ -1,3 +1,26 @@
 # Prefer putting braces around variable references even when not strictly required.
 
 This error is optional and not enabled by default.
+
+## Problematic code:
+
+```shell
+partial_path='example'
+
+curl "http://example.com/$partial_path_version/explain.html"
+```
+
+## Correct code:
+
+```shell
+partial_path='example'
+
+curl "http://example.com/${partial_path}_version/explain.html"
+```
+
+## Rationale:
+
+If a variable gets called, and there is a string that gets appended to the variable that could get misinterpreted as possibly part of the name of the variable. Then it will not call the right variable.
+
+## Related resources:
+- [StackOverflow: How do we separate variables from letters in shell scripting](https://stackoverflow.com/questions/18320133/how-do-we-separate-variables-from-letters-in-shell-scripting)