diff --git a/src/encrypt.c b/src/encrypt.c
index 0b8187dd..6112c1fd 100644
--- a/src/encrypt.c
+++ b/src/encrypt.c
@@ -1426,7 +1426,7 @@ void enc_key_init(int method, const char *pass)
         return;
     }
 
-    // Inilitialize cache
+    // Initialize cache
     cache_create(&iv_cache, 256, NULL);
 
 #if defined(USE_CRYPTO_OPENSSL)
diff --git a/src/manager.c b/src/manager.c
index 2ff2d981..5c0b7bc9 100644
--- a/src/manager.c
+++ b/src/manager.c
@@ -788,7 +788,7 @@ int main(int argc, char **argv)
     manager.nameservers     = nameservers;
     manager.nameserver_num  = nameserver_num;
 
-    // inilitialize ev loop
+    // initialize ev loop
     struct ev_loop *loop = EV_DEFAULT;
 
     // setuid
diff --git a/src/server.c b/src/server.c
index 2f0b9fcc..ca60e9db 100644
--- a/src/server.c
+++ b/src/server.c
@@ -402,7 +402,7 @@ static remote_t *connect_to_remote(struct addrinfo *res,
     const char *iface = server->listen_ctx->iface;
 #endif
 
-    // initilize remote socks
+    // initialize remote socks
     sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
     if (sockfd < 0) {
         ERROR("socket");
@@ -545,9 +545,9 @@ static void server_recv_cb(EV_P_ ev_io *w, int revents)
             // wait for more
             if (verbose) {
 #ifdef __MINGW32__
-                LOGI("imcomplete header: %u", r);
+                LOGI("incomplete header: %u", r);
 #else
-                LOGI("imcomplete header: %zu", r);
+                LOGI("incomplete header: %zu", r);
 #endif
             }
             return;
@@ -1588,7 +1588,7 @@ int main(int argc, char **argv)
     LOGI("initializing ciphers... %s", method);
     int m = enc_init(password, method);
 
-    // inilitialize ev loop
+    // initialize ev loop
     struct ev_loop *loop = EV_DEFAULT;
 
     // setup udns
@@ -1606,7 +1606,7 @@ int main(int argc, char **argv)
     for (int i = 0; i < nameserver_num; i++)
         LOGI("using nameserver: %s", nameservers[i]);
 
-    // inilitialize listen context
+    // initialize listen context
     listen_ctx_t listen_ctx_list[server_num];
 
     // bind to each interface
diff --git a/src/shadowsocks.h b/src/shadowsocks.h
index f883291e..a9ba8d0c 100644
--- a/src/shadowsocks.h
+++ b/src/shadowsocks.h
@@ -70,7 +70,7 @@ extern "C" {
  * Calling this function will block the current thread forever if the server
  * starts successfully.
  *
- * Make sure start the server in a seperate process to avoid any potential
+ * Make sure start the server in a separate process to avoid any potential
  * memory and socket leak.
  *
  * If failed, -1 is returned. Errors will output to the log file.
diff --git a/src/udprelay.c b/src/udprelay.c
index 60859fe0..b76dfbd0 100644
--- a/src/udprelay.c
+++ b/src/udprelay.c
@@ -780,7 +780,7 @@ static void remote_recv_cb(EV_P_ ev_io *w, int revents)
     }
 #endif
 
-    // handle the UDP packet sucessfully,
+    // handle the UDP packet successfully,
     // triger the timer
     ev_timer_again(EV_A_ & remote_ctx->watcher);
 
@@ -1265,16 +1265,16 @@ int init_udprelay(const char *server_host, const char *server_port,
 #endif
                   int mtu, int method, int auth, int timeout, const char *iface)
 {
-    // Inilitialize ev loop
+    // Initialize ev loop
     struct ev_loop *loop = EV_DEFAULT;
 
-    // Inilitialize MTU
+    // Initialize MTU
     if (mtu > 0) {
         packet_size = mtu - 1 - 28 - 2 - 64;
         buf_size    = packet_size * 2;
     }
 
-    // Inilitialize cache
+    // Initialize cache
     struct cache *conn_cache;
     cache_create(&conn_cache, MAX_UDP_CONN_NUM, free_cb);