Update README.md

module-system/README.md

@@ -330,15 +330,20 @@ about this distinction.
 For more information on `Context` and `Spec`, and to see some example implementations, check out the [`sov_modules_api`](./sov-modules-api/) docs.
 
 
-### Module CallMessage.
+### Module CallMessage and `schemars::JsonSchema`.
 Like in the `bank` module the `CallMessage` can be parameterized by `C::Context`. To ensure a smooth wallet experience, we need the `CallMessag`' to implement `schemars::JsonSchema` trait. However, simply adding `derive(schemars::JsonSchema)` to the `CallMessage` definition results in the following error:
-`the trait JsonSchema is not implemented for C`.  
+
+```
+the trait JsonSchema is not implemented for C
+```
 
 
 The reason for this issue is that the standard derive mechanism for `JsonSchema` cannot determine the correct trait bounds for the `Context`. To resolve this, we need to provide the following hint:
 
-`schemars(bound = "C::Address: ::schemars::JsonSchema", rename = "CallMessage")`
+```rust
+schemars(bound = "C::Address: ::schemars::JsonSchema", rename = "CallMessage")
+```
 
-Now, the schemars::derive understands that it is sufficient for only C::Address to implement schemars::JsonSche
+Now, the `schemars::derive` understands that it is sufficient for only `C::Address` to implement `schemars::JsonSchema`
 
-I a `CallMessage` in your module uses an associated type from `Context` you might need to provide a similar hint.
+If `CallMessage` in your module uses an associated type from `Context` you might need to provide a similar hint.