diff --git a/mlir/docs/PatternRewriter.md b/mlir/docs/PatternRewriter.md
--- a/mlir/docs/PatternRewriter.md
+++ b/mlir/docs/PatternRewriter.md
@@ -283,7 +283,7 @@
 
 /// Apply the custom driver to `op`.
 void applyMyPatternDriver(Operation *op,
-                          const RewritePatternSet &patterns) {
+                          const FrozenRewritePatternSet &patterns) {
   // Initialize the custom PatternRewriter.
   MyPatternRewriter rewriter(op->getContext());