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diff --git a/hubtools/Cargo.toml b/hubtools/Cargo.toml
index cfe89d5..dc756cc 100644
--- a/hubtools/Cargo.toml
+++ b/hubtools/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "hubtools"
-version = "0.4.5"
+version = "0.4.6"
 edition = "2021"
 rust-version = "1.66"
 
diff --git a/hubtools/src/caboose.rs b/hubtools/src/caboose.rs
index 306a6be..16a6513 100644
--- a/hubtools/src/caboose.rs
+++ b/hubtools/src/caboose.rs
@@ -44,6 +44,10 @@ impl Caboose {
         self.get_tag(tags::VERS)
     }
 
+    pub fn sign(&self) -> Result<&[u8], CabooseError> {
+        self.get_tag(tags::SIGN)
+    }
+
     fn get_tag(&self, tag: [u8; 4]) -> Result<&[u8], CabooseError> {
         use tlvc::TlvcReader;
         let mut reader = TlvcReader::begin(self.as_slice())
@@ -89,6 +93,7 @@ pub struct CabooseBuilder {
     board: Option<String>,
     name: Option<String>,
     version: Option<String>,
+    sign: Option<String>,
 }
 
 impl CabooseBuilder {
@@ -112,6 +117,11 @@ impl CabooseBuilder {
         self
     }
 
+    pub fn sign<S: Into<String>>(mut self, sign: S) -> Self {
+        self.sign = Some(sign.into());
+        self
+    }
+
     pub fn build(self) -> Caboose {
         let mut pieces = Vec::new();
         for (tag, maybe_value) in [
@@ -119,6 +129,7 @@ impl CabooseBuilder {
             (tags::BORD, self.board),
             (tags::NAME, self.name),
             (tags::VERS, self.version),
+            (tags::SIGN, self.sign),
         ] {
             let Some(value) = maybe_value else {
                 continue;