diff --git a/common/diff.md b/common/diff.md
new file mode 100644
index 0000000000..c75b2e0896
--- /dev/null
+++ b/common/diff.md
@@ -0,0 +1,23 @@
+# diff
+
+> Compare files and directories
+
+- Compare files
+
+`diff {{file1}} {{file2}}`
+
+- Compare files, ignoring white spaces
+
+`diff -w {{file1}} {{file2}}`
+
+- Compare files, showing differences side by side
+
+`diff -y {{file1}} {{file2}}`
+
+- Compare directories recursively
+
+`diff -r {{directory1}} {{directory2}}`
+
+- Compare directories, only showing the names of files that differ 
+
+`diff -rq {{directory1}} {{directory2}}`