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-rw-r--r--doc/contribute.texi3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/contribute.texi b/doc/contribute.texi
index 61922aa..019ea14 100644
--- a/doc/contribute.texi
+++ b/doc/contribute.texi
@@ -3,6 +3,9 @@
Each macro in the Archive has an all-upper-case name with the prefix
@code{AX_}. The macro is stored in a file with the same name, in lower case,
and with the suffix @code{.m4}.
+Unless absolutely necessary, the file contents should be in ASCII.
+For example, use apostrophe (U+27) for quoting identifiers
+instead of Unicode quotation mark characters U+2018, U+2019.
The file should begin with a header comment containing three named sections:
synopsis, description, and license.