diff --git a/src/doc/unstable-book/src/compiler-flags/patchable-function-entry.md b/src/doc/unstable-book/src/compiler-flags/patchable-function-entry.md
index 4f64544e77984..7ad514213c94b 100644
--- a/src/doc/unstable-book/src/compiler-flags/patchable-function-entry.md
+++ b/src/doc/unstable-book/src/compiler-flags/patchable-function-entry.md
@@ -9,7 +9,7 @@ N defaults to 0.
 
 As an illustrative example, `-Z patchable-function-entry=3,2` would produce:
 
-```ignore
+```text
 nop
 nop
 function_label: