diff --git a/zig_notes.md b/zig_notes.md
index c4fc6c8..0613dc0 100644
--- a/zig_notes.md
+++ b/zig_notes.md
@@ -1,3 +1,6 @@
+- Low debug performance may become a problem => investigate!
+
+
 ```zig
 const px: usize = 272 - self.sprite_coords[sprite_index * 2 + 1];
 ```
@@ -47,4 +50,4 @@ const smp_index: u32 = ((voice.waveform << 5) | ((voice.counter >> 15) & 0x1F))
 const mask: u20 = ~(0x0000F << shl);
 ```
 
-^^^ unable to perform binary not operation on type 'comptime_int'
\ No newline at end of file
+^^^ unable to perform binary not operation on type 'comptime_int'