diff --git a/examples/system_instruction.rs b/examples/system_instruction.rs
new file mode 100644
index 0000000..8bde470
--- /dev/null
+++ b/examples/system_instruction.rs
@@ -0,0 +1,50 @@
+use std::sync::Arc;
+
+use gemini_rs::prelude::*;
+
+use gcp_auth::AuthenticationManager;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    tracing_subscriber::fmt().init();
+    let authentication_manager = Arc::new(AuthenticationManager::new().await?);
+    let api_endpoint = std::env::var("API_ENDPOINT")?;
+    let project_id = std::env::var("PROJECT_ID")?;
+    let location_id = std::env::var("LOCATION_ID")?;
+
+    let gemini = GeminiClient::new(
+        authentication_manager,
+        api_endpoint,
+        project_id,
+        location_id,
+    );
+
+    let system_instruction = "Answer as if you were Winston Churchill";
+    let prompt = "What is the airspeed of an unladen swallow?";
+
+    let request = GenerateContentRequest {
+        contents: vec![Content {
+            role: "user".to_string(),
+            parts: Some(vec![Part::Text(prompt.to_string())]),
+        }],
+        system_instruction: Some(Content {
+            role: "system".to_string(),
+            parts: Some(vec![Part::Text(system_instruction.to_string())]),
+        }),
+        ..Default::default()
+    };
+
+    let result = gemini
+        .generate_content(&request, "gemini-1.0-pro-002")
+        .await?;
+
+    if let GenerateContentResponse::Ok {
+        candidates,
+        usage_metadata: _,
+    } = result
+    {
+        println!("Response: {:?}", candidates[0].get_text().unwrap());
+    }
+
+    Ok(())
+}
diff --git a/src/client.rs b/src/client.rs
index 4728e0d..abe7dff 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -127,6 +127,7 @@ impl<T: TokenProvider + Clone> GeminiClient<T> {
                 .collect(),
             generation_config: None,
             tools: None,
+            system_instruction: None,
         };
 
         let response = self.generate_content(&request, model).await?;
@@ -154,6 +155,7 @@ impl<T: TokenProvider + Clone> GeminiClient<T> {
             }],
             generation_config: generation_config.cloned(),
             tools: None,
+            system_instruction: None,
         };
 
         let response = self.generate_content(&request, "gemini-pro").await?;
diff --git a/src/types/error.rs b/src/types/error.rs
index 25c40ec..85baef5 100644
--- a/src/types/error.rs
+++ b/src/types/error.rs
@@ -22,10 +22,22 @@ pub enum ErrorType {
 
     #[serde(rename = "type.googleapis.com/google.rpc.Help")]
     Help { links: Vec<Link> },
+
+    #[serde(rename = "type.googleapis.com/google.rpc.BadRequest")]
+    BadRequest {
+        #[serde(rename = "fieldViolations")]
+        field_violations: Vec<FieldViolation>,
+    },
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
 pub struct ErrorInfoMetadata {
-    service: String,
-    consumer: String,
+    pub service: String,
+    pub consumer: String,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct FieldViolation {
+    pub field: String,
+    pub description: String,
 }
diff --git a/src/types/generate_content.rs b/src/types/generate_content.rs
index 527065d..67aea7c 100644
--- a/src/types/generate_content.rs
+++ b/src/types/generate_content.rs
@@ -4,11 +4,12 @@ use serde::{Deserialize, Serialize};
 
 use super::{Content, Error, Part};
 
-#[derive(Clone, Serialize, Deserialize)]
+#[derive(Clone, Default, Serialize, Deserialize)]
 pub struct GenerateContentRequest {
     pub contents: Vec<Content>,
     pub generation_config: Option<GenerationConfig>,
     pub tools: Option<Vec<Tools>>,
+    pub system_instruction: Option<Content>,
 }
 
 impl GenerateContentRequest {
@@ -20,6 +21,7 @@ impl GenerateContentRequest {
             }],
             generation_config,
             tools: None,
+            system_instruction: None,
         }
     }
 }