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diff --git a/aarch64/kusswurm_ch11.S b/aarch64/kusswurm_ch11.S
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+// ================================================================================================
+// Code written while reading chapter 11 of Modern Arm Assembly Language Programming
+//
+// License:
+//     SPDX-License-Identifier: 0BSD
+//     Copyright (c) 2026 Hunter Kvalevog
+//
+//     Permission to use, copy, modify, and/or distribute this software for any
+//     purpose with or without fee is hereby granted.
+//
+//     THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+//     WITH REGARD TO THIS SOFTWARE.
+// ================================================================================================
+
+#include "common.S"
+
+TEXT_SEGMENT
+
+// example 1
+
+.global SYM(i32_add_sub)
+.global SYM(i64_add_sub)
+
+SYM(i32_add_sub):
+    // w0: a
+    // w1: b
+    // w2: c
+#if 0
+    add w3, w0, w1
+    sub w0, w3, w2
+#else
+    add w0, w0, w1
+    sub w0, w0, w2
+#endif
+    // w0: return
+    ret
+
+SYM(i64_add_sub):
+    // x0: a
+    // x1: b
+    // x2: c
+    add x3, x0, x1
+    sub x0, x3, x2
+    // x0: return
+    ret
+
+// example 2
+
+.global SYM(i32_mul)
+.global SYM(i32_mul_safe)
+
+SYM(i32_mul):
+    // w0: a
+    // w1: b
+    mul w0, w0, w1
+    // w0: return
+    ret
+
+SYM(i32_mul_safe):
+    // w0: a
+    // w1: b
+    smull x0, w0, w1
+    // x0: ret
+    ret
+