diff --git a/src/diff.rs b/src/diff.rs
index 8429101..b41d0e2 100644
--- a/src/diff.rs
+++ b/src/diff.rs
@@ -4,10 +4,21 @@ use terminal_size::{terminal_size, Width};
 
 use crate::{context::Context, utils::get_tree_files};
 
-pub fn diff(context: &Context) -> anyhow::Result<()> {
+pub fn diff(context: &Context, filter: &Option<String>) -> anyhow::Result<()> {
 	std::fs::create_dir_all(&context.install_dir)?;
-	let built_files = get_tree_files(context, &context.build_dir)?;
-	let installed_files = get_tree_files(context, &context.install_dir)?;
+	let mut built_files = get_tree_files(context, &context.build_dir)?;
+	let mut installed_files = get_tree_files(context, &context.install_dir)?;
+	if let Some(filter) = filter {
+		log::debug!("Using filter: {}", filter);
+		built_files = built_files
+			.into_iter()
+			.filter(|path| path.starts_with(filter))
+			.collect();
+		installed_files = installed_files
+			.into_iter()
+			.filter(|path| path.starts_with(filter))
+			.collect();
+	}
 	log::debug!("Built files: {:#?}", built_files);
 	log::debug!("Installed files: {:#?}", installed_files);
 
diff --git a/src/main.rs b/src/main.rs
index ba233f3..8d78960 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -35,11 +35,11 @@ fn main() -> anyhow::Result<()> {
 				apply(&context, &filter, link).expect("Failed to apply");
 			}
 		}
-		opts::Commands::Diff { repo_path } => {
+		opts::Commands::Diff { repo_path, filter } => {
 			let context = build_context(repo_path);
 			log::debug!("Context: {:#?}", context);
 			build(&context).expect("Failed to build");
-			diff(&context).expect("Failed to diff");
+			diff(&context, &filter).expect("Failed to diff");
 		}
 		opts::Commands::GenerateCompletions { shell } => {
 			generate(shell, &mut Opts::command(), "dfm", &mut std::io::stdout());
diff --git a/src/opts.rs b/src/opts.rs
index 142259d..da46937 100644
--- a/src/opts.rs
+++ b/src/opts.rs
@@ -27,7 +27,9 @@ pub enum Commands {
 		)]
 		repo_path: PathBuf,
 
-		#[clap(help = "Filter which files should be installed, checks for substring")]
+		#[clap(
+			help = "Filter which files should be installed, checks if if path starts with this"
+		)]
 		filter: Option<String>,
 
 		#[clap(short, long, default_value = "true", help = "Symlink the built files")]
@@ -42,6 +44,9 @@ pub enum Commands {
 			help = "Path to source repo, absolute path or path relative to $HOME"
 		)]
 		repo_path: PathBuf,
+
+		#[clap(help = "Filter which files should be diffed, checks if if path starts with this")]
+		filter: Option<String>,
 	},
 	#[clap(about = "Generate shell completions")]
 	GenerateCompletions {