diff --git a/hackem_changelog.txt b/hackem_changelog.txt
index df920f912..4ab5d8fe7 100644
--- a/hackem_changelog.txt
+++ b/hackem_changelog.txt
@@ -16,6 +16,7 @@
 
 Version 1.2.0 (unreleased)
 
+Suppress discovery message for firearms after they are known.
 Indestructible items can't be destroyed in BoH explosions.
 Fix: Vecna wasn't getting the Key of Chaos!
 Fix: Lookup for skeleton key matched skeleton monster.
diff --git a/src/dothrow.c b/src/dothrow.c
index 36e7ec6dd..3b0111ef2 100644
--- a/src/dothrow.c
+++ b/src/dothrow.c
@@ -1567,7 +1567,7 @@ struct obj *oldslot; /* for thrown-and-return used with !fixinv */
             pline("The quivered ammo doesn't fit the firearm.");
             gunning = FALSE;
         }
-        if (gunning) {
+        if (gunning && !uwep->known) {
             if (!Deaf)
                 pline("Boom!");
             makeknown_msg(uwep->otyp);