diff --git a/src/bin/fingerprint.rs b/src/bin/fingerprint.rs
index 595a026..d2e4431 100644
--- a/src/bin/fingerprint.rs
+++ b/src/bin/fingerprint.rs
@@ -32,6 +32,10 @@ struct Args {
     #[arg(short, long, default_value_t = 10)]
     top_n: usize,
 
+    /// Include subpart params in fingerprint
+    #[arg(short, long)]
+    include_params: bool,
+
     /// List of input directories to recursively search
     input_dir: String,
 }
@@ -68,7 +72,7 @@ fn main() -> anyhow::Result<()> {
             if should_skip(&arg) {
                 return None;
             }
-            match parse(&arg, youngest) {
+            match parse(&arg, youngest, args.include_params) {
                 Ok(Some(h)) => Some((h, arg)),
                 // Skip old emails
                 Ok(None) => return None,
@@ -116,7 +120,11 @@ fn main() -> anyhow::Result<()> {
 }
 
 // If the date in the email is before youngest Ok(None) will be returned.
-fn parse<P: AsRef<Path>>(path: P, youngest: i64) -> Result<Option<String>, EmailError> {
+fn parse<P: AsRef<Path>>(
+    path: P,
+    youngest: i64,
+    include_params: bool,
+) -> Result<Option<String>, EmailError> {
     let file = File::open(&path)?;
     let mmap = unsafe { MmapOptions::new().map(&file)? };
     let m = parse_mail(&mmap)?;
@@ -131,5 +139,5 @@ fn parse<P: AsRef<Path>>(path: P, youngest: i64) -> Result<Option<String>, Email
         return Ok(None);
     }
     //println!("{}: {:#?}", path.as_ref().display(), m.ctype);
-    Ok(Some(fingerprint(&m).join("\n")))
+    Ok(Some(fingerprint(&m, include_params).join("\n")))
 }
diff --git a/src/bin/summarize.rs b/src/bin/summarize.rs
index 0f5b6ea..bed3e24 100644
--- a/src/bin/summarize.rs
+++ b/src/bin/summarize.rs
@@ -23,7 +23,7 @@ fn main() -> anyhow::Result<()> {
             .headers
             .get_first_value("subject")
             .unwrap_or("(NO SUBJECT)".to_owned());
-        println!("{subject}: {path}\n{}", fingerprint(&m).join("\n"));
+        println!("{subject}: {path}\n{}", fingerprint(&m, false).join("\n"));
     }
     Ok(())
 }
diff --git a/src/lib.rs b/src/lib.rs
index 96eea49..756b98a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -65,15 +65,19 @@ pub fn should_skip(path: &str) -> bool {
     SKIP_FILES.contains(&filename)
 }
 
-pub fn fingerprint(pm: &ParsedMail<'_>) -> Vec<String> {
-    fingerprint_rec(pm, 0)
+pub fn fingerprint(pm: &ParsedMail<'_>, include_params: bool) -> Vec<String> {
+    fingerprint_rec(pm, include_params, 0)
 }
-fn fingerprint_rec(pm: &ParsedMail<'_>, depth: usize) -> Vec<String> {
-    let mut v = vec![format!("{}{}", " ".repeat(depth * 2), pm.ctype.mimetype)];
-    for c in &pm.subparts {
-        v.extend(fingerprint_rec(&c, depth + 1));
+fn fingerprint_rec(pm: &ParsedMail<'_>, include_params: bool, depth: usize) -> Vec<String> {
+    let indent = " ".repeat(depth * 2);
+    let mut parts = vec![format!("{}{}", indent, pm.ctype.mimetype)];
+    for (k, v) in &pm.ctype.params {
+        parts.push(format!("{indent} {k}: {v}"));
     }
-    v
+    for c in &pm.subparts {
+        parts.extend(fingerprint_rec(&c, include_params, depth + 1));
+    }
+    parts
 }
 
 #[cfg(test)]