Write on upper case in instructions

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/README.md b/README.md
index 666de45..33a4dd9 100644
--- a/README.md
+++ b/README.md
@@ -202,6 +202,16 @@ good_thing:
     .byte $01
 ```
 
+Only use upper case for macros or regular constants (as [detailed
+below](#UPPER_CASE-for-macros-and-regular-constants)). For the rest of your code
+stick to lower case and allow syntax highlighting on modern editors do the rest.
+Hence:
+
+``` assembly
+LDA #01     ; bad!
+lda #01     ; good!
+```
+
 ## Use the `@` prefix for named labels which affect the control flow
 
 Named labels which are part of the control flow are to use the `@` symbol as a