diff --git a/CHANGELOG.md b/CHANGELOG.md
index e45f1bb1..5326de59 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -114,6 +114,7 @@
 - Update `Julia` syntax, see #2553 (@dependabot)
 - add `NSIS` support, see #2577 (@idleberg)
 - Update `ssh-config`, see #2697 (@mrmeszaros)
+- Add syntax mapping `*.debdiff` => `diff`, see #2947 (@jacg)
 
 ## `bat` as a library
 
diff --git a/src/syntax_mapping/builtins/common/50-diff.toml b/src/syntax_mapping/builtins/common/50-diff.toml
new file mode 100644
index 00000000..2998d9c5
--- /dev/null
+++ b/src/syntax_mapping/builtins/common/50-diff.toml
@@ -0,0 +1,3 @@
+# .debdiff is the extension used for diffs in Debian packaging
+[mappings]
+"Diff" = ["*.debdiff"]