diff --git a/doc/porting-guide b/doc/porting-guide
index d21360d0..c010a827 100644
--- a/doc/porting-guide
+++ b/doc/porting-guide
@@ -307,7 +307,7 @@ you will have to implement features in Sortix or add some compatibility. Other
 times, you can work around the build system or patch the software.
 
 Try ask around and examine other archived port tixes and see their patches
-reveal any useful advise on how to resolve the situation:
+reveal any useful advice on how to resolve the situation:
 
 Here is a list of common problems:
 
@@ -476,5 +476,5 @@ This should be a basic walk-through the process of porting a piece of software
 to the Sortix operating system. Note how the porting facilities are experimental
 and much is subject to change in the near future. Porting software is an
 advanced topic and this documentation merely touches the more common situations
-and surely important advise is missing from this documentation. It's always a
-good idea to consult the Sortix developers for advise.
+and surely important advice is missing from this documentation. It's always a
+good idea to consult the Sortix developers for advice.
diff --git a/sysinstall/sysinstall.c b/sysinstall/sysinstall.c
index a12c6cdf..e048d226 100644
--- a/sysinstall/sysinstall.c
+++ b/sysinstall/sysinstall.c
@@ -324,7 +324,7 @@ int main(void)
 
 	text("You are about to install a new operating system on this computer. "
 	     "This is not something you should do on a whim or when you are "
-         "impatient. Take the time to read the documentation and be patient "
+	     "impatient. Take the time to read the documentation and be patient "
 	     "while you learn the new system. This is a very good time to start an "
 		 "external music player that plays soothing classical music on loop.\n\n");
 	const char* readies[] =
@@ -557,7 +557,7 @@ int main(void)
 	      "Type mkpart to make a new partition. "
 	      "Type mount 2 / to create a mountpoint for partition 2. "
 	      "Type exit when done. "
-	      "There is partitioning advise in installation(7). "
+	      "There is partitioning advice in installation(7). "
 	      "Type man 8 disked to display the disked(8) man page.\n",
 	      mktable_tip);
 	struct filesystem* root_filesystem = NULL;
@@ -636,7 +636,7 @@ int main(void)
 			while ( true )
 			{
 				prompt(return_to_disked, sizeof(return_to_disked),
-					   "Return to disked to make a BIOS boot partition?", "yes");
+				       "Return to disked to make a BIOS boot partition?", "yes");
 				if ( strcasecmp(accept_grub, "no") == 0 ||
 					 strcasecmp(accept_grub, "yes") == 0 )
 					break;
@@ -739,7 +739,7 @@ int main(void)
 		umask(0022);
 		if ( access("tix/collection.conf", F_OK) < 0 )
 			execute((const char*[]) { "tix-collection", ".", "create",
-		                              "--prefix=", NULL }, "_e");
+			                          "--prefix=", NULL }, "_e");
 		install_manifest("system", "", ".");
 		// TODO: Preserve the existing /src if it exists like in sysupgrade.
 		if ( has_manifest("src") )
@@ -909,7 +909,7 @@ int main(void)
 			{
 				char answer[32];
 				prompt(answer, sizeof(answer),
-					   "Empty password is stupid, are you sure? (yes/no)", "no");
+				       "Empty password is stupid, are you sure? (yes/no)", "no");
 				if ( strcasecmp(answer, "yes") != 0 )
 					continue;
 			}
@@ -925,7 +925,7 @@ int main(void)
 		explicit_bzero(first, sizeof(first));
 		if ( !install_configurationf("etc/passwd", "a",
 				"%s:%s:%" PRIuUID ":%" PRIuGID ":%s:/home/%s:sh\n",
-		        user, hash, uid, gid, name, user) )
+				user, hash, uid, gid, name, user) )
 			continue;
 		if ( !install_configurationf("etc/group", "a",
 				"%s::%" PRIuGID ":%s\n", user, gid, user) )