diff --git a/cognos/src/internal_json.rs b/cognos/src/internal_json.rs
index a8c247f..3198ffd 100644
--- a/cognos/src/internal_json.rs
+++ b/cognos/src/internal_json.rs
@@ -35,6 +35,19 @@ pub enum Verbosity {
   Vomit     = 7,
 }
 
+/// Activity progress tracking for downloads/uploads/builds
+#[derive(Deserialize, Debug, Clone, Copy, PartialEq, Eq)]
+pub struct ActivityProgress {
+  /// Bytes completed
+  pub done:     u64,
+  /// Total bytes expected
+  pub expected: u64,
+  /// Currently running transfers
+  pub running:  u64,
+  /// Failed transfers
+  pub failed:   u64,
+}
+
 pub type Id = u64;
 
 #[derive(Deserialize, Debug, Clone)]