diff --git a/notes/README.asm_file b/notes/README.asm_function
similarity index 99%
rename from notes/README.asm_file
rename to notes/README.asm_function
index ddcaa70..33eea01 100644
--- a/notes/README.asm_file
+++ b/notes/README.asm_function
@@ -1,5 +1,6 @@
 
-Disassemble the entire file containing $pc
+Disassemble the entire function containing $pc
+"-a" requires debug information to find which function contains $pc.
 
 -data-disassemble -a $pc -- 2
 
diff --git a/notes/README.asm_hello b/notes/README.asm_hello
index b390a7c..e89eddd 100644
--- a/notes/README.asm_hello
+++ b/notes/README.asm_hello
@@ -1,4 +1,5 @@
 # Dissembly without and with source lines. Code from .asm do not have source lines. Just assembly.
+# "-a" requires debug information to find which function contains $pc.
 
 -data-disassemble -a $pc -- 2
 
diff --git a/tests/helloasm/README.asm b/tests/helloasm/README.asm
index 60d7c15..8a10c19 100644
--- a/tests/helloasm/README.asm
+++ b/tests/helloasm/README.asm
@@ -20,4 +20,8 @@ debug dialog and start command line.
 Typical _start address is: 0x8048080
 
 
+In gdb, to disassemble a range of memmory. 20 bytes before an
+address to 20 bytes after.
+
+    (gdb) disassemble 0x08048080-20, +20