diff --git a/doc/architectures.qbk b/doc/architectures.qbk
index 16ea1c1c..29605a33 100644
--- a/doc/architectures.qbk
+++ b/doc/architectures.qbk
@@ -11,17 +11,17 @@ __boost_context__, using [link implementation ['fcontext_t]], supports following
 architectures:
 
 [table Supported architectures (<ABI|binary format>)
-    [[Architecture]  [LINUX (UNIX)]   [Windows]  [MacOS X]     [iOS]]
-    [[arm (aarch32)] [AAPCS|ELF]      [AAPCS|PE] [-]           [AAPCS|MACH-O]]
-    [[arm (aarch64)] [AAPCS|ELF]      [-]        [-]           [AAPCS|MACH-O]]
-    [[i386]          [SYSV|ELF]       [MS|PE]    [SYSV|MACH-O] [-]]
-    [[mips1]         [O32|ELF]        [-]        [-]           [-]]
-    [[ppc32]         [SYSV|ELF,XCOFF] [-]        [SYSV|MACH-O] [-]]
-    [[ppc64]         [SYSV|ELF,XCOFF] [-]        [SYSV|MACH-O] [-]]
-    [[riscv64]       [SYSV|ELF]       [-]        [SYSV]        [-]]
-    [[s390x]         [SYSV|ELF]       [-]        [-]           [-]]
-    [[sparc]         [-]              [-]        [-]           [-]]
-    [[x86_64]        [SYSV,X32|ELF]   [MS|PE]    [SYSV|MACH-O] [-]]
+    [[Architecture]  [LINUX (UNIX)]   [Windows]  [MacOS X]      [iOS]]
+    [[arm (aarch32)] [AAPCS|ELF]      [AAPCS|PE] [-]            [AAPCS|MACH-O]]
+    [[arm (aarch64)] [AAPCS|ELF]      [-]        [AAPCS|MACH-O] [AAPCS|MACH-O]]
+    [[i386]          [SYSV|ELF]       [MS|PE]    [SYSV|MACH-O]  [-]]
+    [[mips1]         [O32|ELF]        [-]        [-]            [-]]
+    [[ppc32]         [SYSV|ELF,XCOFF] [-]        [SYSV|MACH-O]  [-]]
+    [[ppc64]         [SYSV|ELF,XCOFF] [-]        [SYSV|MACH-O]  [-]]
+    [[riscv64]       [SYSV|ELF]       [-]        [SYSV]         [-]]
+    [[s390x]         [SYSV|ELF]       [-]        [-]            [-]]
+    [[sparc]         [-]              [-]        [-]            [-]]
+    [[x86_64]        [SYSV,X32|ELF]   [MS|PE]    [SYSV|MACH-O]  [-]]
 ]
 
 [note If the architecture is not supported but the platform provides