diff --git a/sim/src/image.rs b/sim/src/image.rs
index bb964fa..5ef0e57 100644
--- a/sim/src/image.rs
+++ b/sim/src/image.rs
@@ -1652,6 +1652,8 @@
     }
 }
 
+/// Construct a TLV generator based on how MCUboot is currently configured.  The returned
+/// ManifestGen will generate the appropriate entries based on this configuration.
 fn make_tlv() -> TlvGen {
     if Caps::EcdsaP224.present() {
         panic!("Ecdsa P224 not supported in Simulator");