diff --git a/clang/docs/Block-ABI-Apple.rst b/clang/docs/Block-ABI-Apple.rst
index e21a8b68b5cd1..4f98b3ba65386 100644
--- a/clang/docs/Block-ABI-Apple.rst
+++ b/clang/docs/Block-ABI-Apple.rst
@@ -46,7 +46,7 @@ the following form:
         int reserved; 
         R (*invoke)(struct Block_literal_1 *, P...);
         struct Block_descriptor_1 {
-        unsigned long int reserved;         // NULL
+            unsigned long int reserved;     // NULL
             unsigned long int size;         // sizeof(struct Block_literal_1)
             // optional helper functions
             void (*copy_helper)(void *dst, void *src);     // IFF (1<<25)