--- a/.gitattributes	Thu Oct 25 07:37:49 2018 +0900
+++ b/.gitattributes	Thu Feb 13 11:34:05 2020 +0900
@@ -1,1 +1,10 @@
-*.{c,C,cc,h} whitespace=indent-with-non-tab,space-before-tab,trailing-space
+# Add indent-with-non-tab to the default git whitespace warnings.
+# Note that this file doesn't support bash-style brace expansion.
+
+*.[cCh] whitespace=indent-with-non-tab,space-before-tab,trailing-space
+*.cc whitespace=indent-with-non-tab,space-before-tab,trailing-space
+ChangeLog whitespace=indent-with-non-tab,space-before-tab,trailing-space
+# Make diff on MD files use "(define" as a function marker.
+# Use together with git config diff.md.xfuncname '^\(define.*$'
+# which is run by contrib/gcc-git-customization.sh too.
+*.md diff=md