diff --git a/HACKING b/HACKING
index 000924485c..942d46ee2a 100644
--- a/HACKING
+++ b/HACKING
@@ -9,7 +9,7 @@ Code Style
 In order to maintain consistency and readability, we ask that you
 adhere to the following style guidelines:
 
- - Standard Ruby soft tabs, not hard tabs.
+ - Standard Ruby two-space soft tabs, not hard tabs.
  - Try to keep your lines under 100 columns (assuming two-space tabs)
  - do; end instead of {} for a block
  - Always use str[0,1] instead of str[0]