diff --git a/README.md b/README.md
index a0cbd54..105c40d 100644
--- a/README.md
+++ b/README.md
@@ -85,8 +85,10 @@ The placeholder is evaluated as following:
 - `{{command}}`: All the command without any modification
 - `{{command[1]}}`: The first argument of the command (the command itself has index of 0)
 - `{{command[2:5]}}`: The second to fifth arguments. If any of the side is not specified, them it defaults to the start (if it is left) or the end (if it is right).
-- `{{typo[2](fix1, fix2)}}`: This will try to change the second argument to candidates in the parenthesis. The argument in parentheses must have at least 2 values. Single arguments are reserved for specific matches, for instance, `path` to search all commands found in the `$PATH` environment.
+- `{{typo[2](fix1, fix2)}}`: This will try to change the second argument to candidates in the parenthesis. The argument in parentheses must have at least 2 values. Single arguments are reserved for specific matches, for instance, `path` to search all commands found in the `$PATH` environment, or the `{{shell}}` placeholder, among others.
 - `{{opt::<Regular Expression>}}`: Optional patterns that are found in the command with RegEx (see RegEx crate for syntax). Note that all patterns matching this placeholder will not take a place when indexing.
+- `{{err::<Regular Expression}}`: Get the matching patterns from the error message.
+- `{{shell(<shell commands>)}}`: Replace with the output of the shell command. This placeholder can be used along `{{typo}}` as its only argument, where each newline will be evaluated to a candidate.
 
 The suggestion can have additional conditions to check. To specify the conditions, add a `#[...]` at the first line (just like derive macros in Rust). Available conditions: