diff --git a/test/asm/jr-@.asm b/test/asm/jr-@.asm
index c6c70b62..0f6278bc 100644
--- a/test/asm/jr-@.asm
+++ b/test/asm/jr-@.asm
@@ -6,5 +6,5 @@ SECTION "fixed", ROM0[0]
 SECTION "floating", ROM0
 	jr @
 
-; We rely on this landing at address $0002, which isn't *guaranteed*...
+; XXX: We rely on this landing at address $0002, which isn't *guaranteed*...
 assert STARTOF("floating") == 2
diff --git a/test/asm/pc.asm b/test/asm/pc.asm
index dbacbca0..257960c2 100644
--- a/test/asm/pc.asm
+++ b/test/asm/pc.asm
@@ -8,5 +8,5 @@ SECTION "floating", ROM0
 	ds 42
 	db @
 
-; We rely on this landing at address $0000, which isn't *guaranteed*...
+; XXX: We rely on this landing at address $0000, which isn't *guaranteed*...
 assert STARTOF("floating") == 0
diff --git a/test/link/db-@.asm b/test/link/db-@.asm
index aaf6daad..f32134ed 100644
--- a/test/link/db-@.asm
+++ b/test/link/db-@.asm
@@ -6,5 +6,5 @@ SECTION "fixed", ROM0[0]
 SECTION "floating", ROM0
 	db @, @, @
 
-; We rely on this landing at address $0003, which isn't *guaranteed*...
+; XXX: We rely on this landing at address $0003, which isn't *guaranteed*...
 assert STARTOF("floating") == 3
diff --git a/test/link/patch-diagnostics.asm b/test/link/patch-diagnostics.asm
index 6f400703..a7f33883 100644
--- a/test/link/patch-diagnostics.asm
+++ b/test/link/patch-diagnostics.asm
@@ -11,5 +11,5 @@ ld a, 1 >> ({fzero} + 32)
 ld a, 1 >>> ({fzero} - 1)
 ld a, 1 >>> ({fzero} + 32)
 
-; We rely on this landing at address $0000, which isn't *guaranteed*...
+; XXX: We rely on this landing at address $0000, which isn't *guaranteed*...
 assert startof("test") == 0