diff --git a/README.md b/README.md
index 04318f9..788f6df 100644
--- a/README.md
+++ b/README.md
@@ -86,6 +86,12 @@ Please follow the instruction for your shell:
 > eval $(_PR_SHELL=sh _PR_LAST_COMMAND="git comit" pay-respects)
 > ```
 
+> Following variables are not required, but can be used to reduce unnecessary operations:
+>
+> - `_PR_ALIAS`: A list of aliases to commands. Separated by newlines with zsh-like formatting, e.g. `gc=git commit`
+> - `_PR_ERROR_MSG`: Error message from the previous command. `pay-respects` will rerun previous command to get the error message if absent
+> - `_PR_EXECUTABLES`: A space separated list of commands/executables. `pay-respects` will search for `$PATH` if absent
+
 </details>
 
 <details>
diff --git a/module-runtime-rules/src/main.rs b/module-runtime-rules/src/main.rs
index d29c404..bf2ecc1 100644
--- a/module-runtime-rules/src/main.rs
+++ b/module-runtime-rules/src/main.rs
@@ -23,14 +23,7 @@ fn main() -> Result<(), std::io::Error> {
 	let shell = std::env::var("_PR_SHELL").expect("_PR_SHELL not set");
 	let last_command = std::env::var("_PR_LAST_COMMAND").expect("_PR_LAST_COMMAND not set");
 	let error_msg = std::env::var("_PR_ERROR_MSG").expect("_PR_ERROR_MSG not set");
-	let executables: Vec<String> = {
-		let exes = std::env::var("_PR_EXECUTABLES").expect("_PR_EXECUTABLES not set");
-		if exes.is_empty() {
-			get_path_files()
-		} else {
-			exes.split(" ").map(|s| s.to_string()).collect()
-		}
-	};
+	let executables: Vec<String> = get_path_files();
 
 	#[cfg(debug_assertions)]
 	{
diff --git a/utils/src/files.rs b/utils/src/files.rs
index 0f207ab..113c680 100644
--- a/utils/src/files.rs
+++ b/utils/src/files.rs
@@ -6,6 +6,13 @@ use crate::evals::find_similar;
 use itertools::Itertools;
 
 pub fn get_path_files() -> Vec<String> {
+	let env = std::env::var("_PR_EXECUTABLES");
+	if let Ok(env) = env {
+		if !env.is_empty() {
+			return env.split(' ').map(|s| s.to_owned()).collect();
+		}
+	}
+
 	let path_env = path_env();
 
 	#[cfg(debug_assertions)]