diff --git a/Cargo.toml b/Cargo.toml
index caa051d..7c99f2b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ async-trait = "0.1.68"
 auto_impl = "1.1.0"
 cairo-starknet-2-0-1 = { package = "cairo-lang-starknet", version = "=2.0.1" }
 chrono = "0.4.26"
-clap = { version = "4.3.8", features = ["derive", "env"] }
+clap = { version = "4.3.8", features = ["derive", "env", "string"] }
 clap_complete = "4.3.1"
 colored = "2.0.0"
 colored_json = "3.2.0"
diff --git a/src/signer.rs b/src/signer.rs
index d194827..6ea36d5 100644
--- a/src/signer.rs
+++ b/src/signer.rs
@@ -28,7 +28,7 @@ pub enum AnySignerSignError {
 
 #[derive(Debug, Clone, Parser)]
 pub struct SignerArgs {
-    #[clap(long, help = "Path to keystore JSON file")]
+    #[clap(long, help = keystore_help())]
     keystore: Option<String>,
     #[clap(
         long,
@@ -141,3 +141,10 @@ impl SignerArgs {
         Ok(AnySigner::LocalWallet(LocalWallet::from_signing_key(key)))
     }
 }
+
+fn keystore_help() -> String {
+    format!(
+        "Path to keystore JSON file [env: STARKNET_KEYSTORE={}]",
+        std::env::var("STARKNET_KEYSTORE").unwrap_or_default()
+    )
+}