Update lab1.md

diff --git a/instructions/lab1.md b/instructions/lab1.md
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--- a/instructions/lab1.md
+++ b/instructions/lab1.md
@@ -277,6 +277,9 @@ The library includes the following relevant functions:
 int stab_info(uint eip, struct stab_info *info);
 ```
 
+Sometimes (in the instance of compiler optimizations or assembly functions) the 
+`stab_info` function cannot find a symbol for a valid return address, in this instance
+your backtrace function should print the function name as <unknown> with an offset of 0.
 
 ## Part 3 - Modifying boot.