diff --git a/llvm/docs/CommandGuide/opt.rst b/llvm/docs/CommandGuide/opt.rst
--- a/llvm/docs/CommandGuide/opt.rst
+++ b/llvm/docs/CommandGuide/opt.rst
@@ -104,6 +104,10 @@
 
      opt -load=plugin.so -help
 
+.. option:: -print-passes
+
+ Print all available passes and exit.
+
 EXIT STATUS
 -----------