diff --git a/docs/reference.md b/docs/reference.md
index 02295b7..fddf244 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -833,12 +833,12 @@
   --xcode-configs=<config_name_list>
       Configure the list of build configuration supported by the generated
       project. If specified, must be a list of semicolon-separated strings.
-      If ommitted, a single configuration will be used in the generated
+      If omitted, a single configuration will be used in the generated
       project derived from the build directory.
 
   --xcode-config-build-dir=<string>
       If present, must be a path relative to the source directory. It will
-      default to $root_out_dir if ommitted. The path is assumed to point to
+      default to $root_out_dir if omitted. The path is assumed to point to
       the directory where ninja needs to be invoked. This variable can be
       used to build for multiple configuration / platform / environment from
       the same generated Xcode project (assuming that the user has created a
@@ -855,7 +855,7 @@
 
   --xcode-additional-files-roots=<path_list>
       If present, must be a list of semicolon-separated paths. It will be used
-      as roots when looking for additional files to add. If ommitted, defaults
+      as roots when looking for additional files to add. If omitted, defaults
       to "//".
 
   --ninja-executable=<string>
@@ -5815,7 +5815,7 @@
 
   Not all GN targets that get evaluated are actually turned into ninja targets
   (see "gn help execution"). If this target is generated, then any targets in
-  the "gen_deps" list will also be generated, regardless of the usual critera.
+  the "gen_deps" list will also be generated, regardless of the usual criteria.
 
   Since "gen_deps" are not build time dependencies, there can be cycles between
   "deps" and "gen_deps" or within "gen_deps" itself.
diff --git a/src/gn/command_gen.cc b/src/gn/command_gen.cc
index 5d4b75b..bf6d6df 100644
--- a/src/gn/command_gen.cc
+++ b/src/gn/command_gen.cc
@@ -563,12 +563,12 @@
   --xcode-configs=<config_name_list>
       Configure the list of build configuration supported by the generated
       project. If specified, must be a list of semicolon-separated strings.
-      If ommitted, a single configuration will be used in the generated
+      If omitted, a single configuration will be used in the generated
       project derived from the build directory.
 
   --xcode-config-build-dir=<string>
       If present, must be a path relative to the source directory. It will
-      default to $root_out_dir if ommitted. The path is assumed to point to
+      default to $root_out_dir if omitted. The path is assumed to point to
       the directory where ninja needs to be invoked. This variable can be
       used to build for multiple configuration / platform / environment from
       the same generated Xcode project (assuming that the user has created a
@@ -585,7 +585,7 @@
 
   --xcode-additional-files-roots=<path_list>
       If present, must be a list of semicolon-separated paths. It will be used
-      as roots when looking for additional files to add. If ommitted, defaults
+      as roots when looking for additional files to add. If omitted, defaults
       to "//".
 
   --ninja-executable=<string>
diff --git a/src/gn/commands.cc b/src/gn/commands.cc
index f81f7ab..b535b20 100644
--- a/src/gn/commands.cc
+++ b/src/gn/commands.cc
@@ -387,14 +387,14 @@
 // static
 const CommandSwitches& CommandSwitches::Get() {
   CHECK(s_global_switches_.is_initialized())
-      << "Missing previous succesful call to CommandSwitches::Init()";
+      << "Missing previous successful call to CommandSwitches::Init()";
   return s_global_switches_;
 }
 
 // static
 CommandSwitches CommandSwitches::Set(CommandSwitches new_switches) {
   CHECK(s_global_switches_.is_initialized())
-      << "Missing previous succesful call to CommandSwitches::Init()";
+      << "Missing previous successful call to CommandSwitches::Init()";
   CommandSwitches result = std::move(s_global_switches_);
   s_global_switches_ = std::move(new_switches);
   return result;
diff --git a/src/gn/variables.cc b/src/gn/variables.cc
index 8eb2a99..4013e16 100644
--- a/src/gn/variables.cc
+++ b/src/gn/variables.cc
@@ -526,7 +526,7 @@
 
   Not all GN targets that get evaluated are actually turned into ninja targets
   (see "gn help execution"). If this target is generated, then any targets in
-  the "gen_deps" list will also be generated, regardless of the usual critera.
+  the "gen_deps" list will also be generated, regardless of the usual criteria.
 
   Since "gen_deps" are not build time dependencies, there can be cycles between
   "deps" and "gen_deps" or within "gen_deps" itself.