diff --git a/src/lager_app.erl b/src/lager_app.erl
index e4fc8dc..73ee071 100644
--- a/src/lager_app.erl
+++ b/src/lager_app.erl
@@ -265,7 +265,7 @@ maybe_make_handler_id(Mod, Config) ->
     %% Allow the backend to generate a gen_event handler id, if it wants to.
     %% We don't use erlang:function_exported here because that requires the module
     %% already be loaded, which is unlikely at this phase of startup. Using code:load
-    %% caused undesireable side-effects with generating code-coverage reports.
+    %% caused undesirable side-effects with generating code-coverage reports.
     try Mod:config_to_id(Config) of
         Id ->
             {Id, Config}
diff --git a/src/lager_default_formatter.erl b/src/lager_default_formatter.erl
index 1979fd8..6445c79 100644
--- a/src/lager_default_formatter.erl
+++ b/src/lager_default_formatter.erl
@@ -172,7 +172,7 @@ basic_test_() ->
                         [date, " ", time," [",severity,"] ",pid, " ", message, "\n"]
                     )))
         },
-        {"Non existant metadata can default to string",
+        {"Non existent metadata can default to string",
             ?_assertEqual(iolist_to_binary([Date, " ", Time, " [error] Fallback Message\n"]),
                 iolist_to_binary(format(lager_msg:new("Message",
                             Now,
@@ -182,7 +182,7 @@ basic_test_() ->
                         [date, " ", time," [",severity,"] ",{does_not_exist,"Fallback"}, " ", message, "\n"]
                     )))
         },
-        {"Non existant metadata can default to other metadata",
+        {"Non existent metadata can default to other metadata",
             ?_assertEqual(iolist_to_binary([Date, " ", Time, " [error] Fallback Message\n"]),
                 iolist_to_binary(format(lager_msg:new("Message",
                             Now,
@@ -192,7 +192,7 @@ basic_test_() ->
                         [date, " ", time," [",severity,"] ",{does_not_exist,pid}, " ", message, "\n"]
                     )))
         },
-        {"Non existant metadata can default to a string2",
+        {"Non existent metadata can default to a string2",
             ?_assertEqual(iolist_to_binary(["Unknown Pid"]),
                 iolist_to_binary(format(lager_msg:new("Message",
                             Now,
diff --git a/src/lager_file_backend.erl b/src/lager_file_backend.erl
index fd645f0..1c18dc4 100644
--- a/src/lager_file_backend.erl
+++ b/src/lager_file_backend.erl
@@ -83,19 +83,19 @@
 
 -spec init([option(),...]) -> {ok, #state{}} | {error, bad_config}.
 init({FileName, LogLevel}) when is_list(FileName), is_atom(LogLevel) ->
-    %% backwards compatability hack
+    %% backwards compatibility hack
     init([{file, FileName}, {level, LogLevel}]);
 init({FileName, LogLevel, Size, Date, Count}) when is_list(FileName), is_atom(LogLevel) ->
-    %% backwards compatability hack
+    %% backwards compatibility hack
     init([{file, FileName}, {level, LogLevel}, {size, Size}, {date, Date}, {count, Count}]);
 init([{FileName, LogLevel, Size, Date, Count}, {Formatter,FormatterConfig}]) when is_list(FileName), is_atom(LogLevel), is_atom(Formatter) ->
-    %% backwards compatability hack
+    %% backwards compatibility hack
     init([{file, FileName}, {level, LogLevel}, {size, Size}, {date, Date}, {count, Count}, {formatter, Formatter}, {formatter_config, FormatterConfig}]);
 init([LogFile,{Formatter}]) ->
-    %% backwards compatability hack
+    %% backwards compatibility hack
     init([LogFile,{Formatter,[]}]);
 init([{FileName, LogLevel}, {Formatter,FormatterConfig}]) when is_list(FileName), is_atom(LogLevel), is_atom(Formatter) ->
-    %% backwards compatability hack
+    %% backwards compatibility hack
     init([{file, FileName}, {level, LogLevel}, {formatter, Formatter}, {formatter_config, FormatterConfig}]);
 init(LogFileConfig) when is_list(LogFileConfig) ->
     case validate_logfile_proplist(LogFileConfig) of
diff --git a/src/lager_transform.erl b/src/lager_transform.erl
index 208a069..7648c46 100644
--- a/src/lager_transform.erl
+++ b/src/lager_transform.erl
@@ -172,7 +172,7 @@ do_transform(Line, SinkName, Severity, Arguments0, Safety) ->
                                        [Attrs, Format, Args] ->
                                            {concat_lists(Attrs, DefaultAttrs), Format, Args}
                                    end,
-    %% Generate some unique variable names so we don't accidentaly export from case clauses.
+    %% Generate some unique variable names so we don't accidentally export from case clauses.
     %% Note that these are not actual atoms, but the AST treats variable names as atoms.
     LevelVar = make_varname("__Level", Line),
     TracesVar = make_varname("__Traces", Line),