diff --git a/HACKING b/HACKING
index 334708aa7..342c5bee8 100644
--- a/HACKING
+++ b/HACKING
@@ -8,7 +8,7 @@ things, in which case I *might* edit it.  Don't bet on it, though.
 
 Here are the highlights:
     Indents are FOUR (4) spaces.  Not 8, not 5 or 2 and definitely NOT tab.
-    Limit all lines to a maximum of 79 characters.
+    Limit all lines to a maximum of 80 characters.
     Use UTF-8 encoding
     Every single import should be on its own line
     Avoid extraneous whitespace in the following situations: