diff --git a/src/generation.rs b/src/generation.rs
index 1169523..e739bcd 100644
--- a/src/generation.rs
+++ b/src/generation.rs
@@ -1,6 +1,6 @@
 pub mod chat;
 pub mod completion;
 pub mod embeddings;
-pub mod format;
 pub mod images;
 pub mod options;
+pub mod parameters;
diff --git a/src/generation/chat/request.rs b/src/generation/chat/request.rs
index bbc9d8b..184afd0 100644
--- a/src/generation/chat/request.rs
+++ b/src/generation/chat/request.rs
@@ -1,6 +1,6 @@
 use serde::Serialize;
 
-use crate::generation::{format::FormatType, options::GenerationOptions};
+use crate::generation::{options::GenerationOptions, parameters::FormatType};
 
 use super::ChatMessage;
 
diff --git a/src/generation/completion/request.rs b/src/generation/completion/request.rs
index 10ccbe4..d306d94 100644
--- a/src/generation/completion/request.rs
+++ b/src/generation/completion/request.rs
@@ -1,6 +1,10 @@
 use serde::Serialize;
 
-use crate::generation::{format::FormatType, images::Image, options::GenerationOptions};
+use crate::generation::{
+    images::Image,
+    options::GenerationOptions,
+    parameters::{FormatType, KeepAlive},
+};
 
 use super::GenerationContext;
 
@@ -16,6 +20,7 @@ pub struct GenerationRequest {
     pub template: Option<String>,
     pub context: Option<GenerationContext>,
     pub format: Option<FormatType>,
+    pub keep_alive: Option<KeepAlive>,
     pub(crate) stream: bool,
 }
 
@@ -30,6 +35,7 @@ impl GenerationRequest {
             template: None,
             context: None,
             format: None,
+            keep_alive: None,
             // Stream value will be overwritten by Ollama::generate_stream() and Ollama::generate() methods
             stream: false,
         }
@@ -76,4 +82,10 @@ impl GenerationRequest {
         self.format = Some(format);
         self
     }
+
+    /// Used to control how long a model stays loaded in memory, by default models are unloaded after 5 minutes of inactivity
+    pub fn keep_alive(mut self, keep_alive: KeepAlive) -> Self {
+        self.keep_alive = Some(keep_alive);
+        self
+    }
 }
diff --git a/src/generation/format.rs b/src/generation/format.rs
deleted file mode 100644
index 65bcb09..0000000
--- a/src/generation/format.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-use serde::{Deserialize, Serialize};
-
-/// The format to return a response in. Currently the only accepted value is `json`
-#[derive(Debug, Serialize, Deserialize, Clone)]
-#[serde(rename_all = "lowercase")]
-pub enum FormatType {
-    Json,
-}
diff --git a/src/generation/parameters.rs b/src/generation/parameters.rs
new file mode 100644
index 0000000..53f53cf
--- /dev/null
+++ b/src/generation/parameters.rs
@@ -0,0 +1,51 @@
+use serde::{Deserialize, Serialize};
+
+/// The format to return a response in. Currently the only accepted value is `json`
+#[derive(Debug, Serialize, Deserialize, Clone)]
+#[serde(rename_all = "lowercase")]
+pub enum FormatType {
+    Json,
+}
+
+/// Used to control how long a model stays loaded in memory, by default models are unloaded after 5 minutes of inactivity
+#[derive(Debug, Clone)]
+pub enum KeepAlive {
+    Indefinitely,
+    UnloadOnCompletion,
+    Until { time: u64, unit: TimeUnit },
+}
+
+impl Serialize for KeepAlive {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        match self {
+            KeepAlive::Indefinitely => serializer.serialize_i8(-1),
+            KeepAlive::UnloadOnCompletion => serializer.serialize_i8(0),
+            KeepAlive::Until { time, unit } => {
+                let mut s = String::new();
+                s.push_str(&time.to_string());
+                s.push_str(unit.to_symbol());
+                serializer.serialize_str(&s)
+            }
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub enum TimeUnit {
+    Seconds,
+    Minutes,
+    Hours,
+}
+
+impl TimeUnit {
+    pub fn to_symbol(&self) -> &'static str {
+        match self {
+            TimeUnit::Seconds => "s",
+            TimeUnit::Minutes => "m",
+            TimeUnit::Hours => "hr",
+        }
+    }
+}