global: remove unnecessary horizontal tabs.

[bison.git] / README-hacking

diff --git a/README-hacking b/README-hacking
index 6a24062490beab5274eab83d128849494a885470..7cb792869edf346d4b37360b5a487c428b9282ca 100644 (file)
--- a/README-hacking
+++ b/README-hacking
@@ -46,6 +46,13 @@ of the .output file etc.  This excludes impossible error messages
 (comparable to assert/abort), and all the --trace output which is
 meant for the maintainers only.
 
+** Horizontal tabs
+Do not add horizontal tab characters to any file in Bison's repository
+except where required.  For example, do not use tabs to format C code.
+However, make files, ChangeLog, and some regular expressions require
+tabs.  Also, test cases might need to contain tabs to check that Bison
+properly processes tabs in its input.
+
 
 * Working from the repository