diff --git a/doc/architectures.qbk b/doc/architectures.qbk
index 8cd33eae..b17e1f22 100644
--- a/doc/architectures.qbk
+++ b/doc/architectures.qbk
@@ -21,7 +21,7 @@ architectures:
     [[ppc64]         [SYSV|ELF|XCOFF] [-]        [SYSV|MACH-O]  [-]]
     [[riscv64]       [SYSV|ELF]       [-]        [SYSV]         [-]]
     [[s390x]         [SYSV|ELF]       [-]        [-]            [-]]
-    [[sparc]         [-]              [-]        [-]            [-]]
+    [[sparc64]       [SYSV|ELF]       [-]        [-]            [-]]
     [[x86_64]        [SYSV,X32|ELF]   [MS|PE]    [SYSV|MACH-O]  [-]]
 ]
 
diff --git a/doc/stack.qbk b/doc/stack.qbk
index 4445a807..171a7969 100644
--- a/doc/stack.qbk
+++ b/doc/stack.qbk
@@ -291,7 +291,7 @@ a stack.]]
 [variablelist
 [[Returns:] [Returns a default stack size, which may be platform specific.
 If the stack is unbounded then the present implementation returns the maximum of
-`64 kB` and `minimum_size()`.]]
+`128 kB` and `minimum_size()`.]]
 [[Throws:] [Nothing.]]
 ]