diff --git a/readme.txt b/readme.txt
index ff023fa..77c3157 100644
--- a/readme.txt
+++ b/readme.txt
@@ -38,6 +38,10 @@ On Debian, it is sufficient to run this command:
 Then, just run "make debug". Calcite will be booted in QEMU, and GDB will be
 attached to it. Use "c" or "continue" in GDB to start execution.
 
+While debugging, it is useful to disable optimizations and enable debugging
+information. In the makefile, under CC_EXTRA_FLAGS, you can change "-O3" to
+"-Og -ggdb". Then, run "make clean" and then "make" again.
+
 === License
 
 Calcite is Copyright 2025 Benji Dial, and licensed under the GNU GPL v3. See