diff --git a/src/os/unix/ngx_darwin_sendfile_chain.c b/src/os/unix/ngx_darwin_sendfile_chain.c
index c869765..ec247d2 100644
--- a/src/os/unix/ngx_darwin_sendfile_chain.c
+++ b/src/os/unix/ngx_darwin_sendfile_chain.c
@@ -173,7 +173,7 @@
 
         if (file && header.nelts == 0) {
 
-            /* create the tailer iovec and coalesce the neighbouring bufs */
+            /* create the trailer iovec and coalesce the neighbouring bufs */
 
             prev = NULL;
             iov = NULL;
diff --git a/src/os/unix/ngx_freebsd_sendfile_chain.c b/src/os/unix/ngx_freebsd_sendfile_chain.c
index 610697d..26b3267 100644
--- a/src/os/unix/ngx_freebsd_sendfile_chain.c
+++ b/src/os/unix/ngx_freebsd_sendfile_chain.c
@@ -178,7 +178,7 @@
 
         if (file) {
 
-            /* create the tailer iovec and coalesce the neighbouring bufs */
+            /* create the trailer iovec and coalesce the neighbouring bufs */
 
             prev = NULL;
             iov = NULL;
diff --git a/src/os/unix/ngx_user.c b/src/os/unix/ngx_user.c
index cb452e6..27f990e 100644
--- a/src/os/unix/ngx_user.c
+++ b/src/os/unix/ngx_user.c
@@ -67,7 +67,7 @@
 
 #if (NGX_THREADS && NGX_NONREENTRANT_CRYPT)
 
-    /* crypt() is a time consuming funtion, so we only try to lock */
+    /* crypt() is a time consuming function, so we only try to lock */
 
     if (ngx_mutex_trylock(ngx_crypt_mutex) != NGX_OK) {
         return NGX_AGAIN;
diff --git a/src/os/win32/ngx_service.c b/src/os/win32/ngx_service.c
index d8b41a9..5bed9a7 100644
--- a/src/os/win32/ngx_service.c
+++ b/src/os/win32/ngx_service.c
@@ -20,7 +20,7 @@
 {
     /* primary thread */
 
-    /* StartServiceCtrlDispatcher() shouxpdl be called within 30 seconds */
+    /* StartServiceCtrlDispatcher() should be called within 30 seconds */
 
     if (StartServiceCtrlDispatcher(st) == 0) {
         ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,