diff --git a/doc/book/building/unix b/doc/book/building/unix
index bf89e96..ff83e34 100644
--- a/doc/book/building/unix
+++ b/doc/book/building/unix
@@ -1,4 +1,4 @@
-# Building on BSD, Linux, macOS, and outher Unix Targets
+# Building on BSD, Linux, macOS, and other Unix Targets
 
 RETRO is well supported on BSD (tested on FreeBSD, NetBSD,
 OpenBSD), Linux, and macOS systems. It should build on any
diff --git a/doc/book/toolchain/info/additional-tools b/doc/book/toolchain/info/additional-tools
index bf07ba4..d22d3c9 100644
--- a/doc/book/toolchain/info/additional-tools
+++ b/doc/book/toolchain/info/additional-tools
@@ -39,7 +39,7 @@ Example command line:
     retro-extend ngaImage example/rot13.forth
 
 Pass the image name as the first argument, and then file names
-as susequent ones. Do *not* use this for things relying on I/O
+as subsequent ones. Do *not* use this for things relying on I/O
 apart from the basic console output as it doesn't emulate other
 devices. If you need to load in things that rely on using the
 optional I/O devices, see the **Advanced Builds** chapter.