diff --git a/mongoose.c b/mongoose.c
index c0bb23e6..b84c2ae0 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -661,7 +661,6 @@ void mg_bsd_transport_close(void *t) {
 
 
 
-
 #define MG_NO_CACHE_HEADERS "Cache-Control: no-cache\r\n"
 #define MG_JSON_HEADERS "Content-Type: application/json\r\n" MG_NO_CACHE_HEADERS
 
diff --git a/mongoose.h b/mongoose.h
index 7b47670d..cf56f0e1 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -1434,6 +1434,7 @@ extern const struct mg_mem_file mg_packed_files[];  // Generated by "pack" util
 
 
 
+
 #if MG_ENABLE_ASSERT
 #include <assert.h>
 #elif !defined(assert)
@@ -1907,6 +1908,7 @@ void mg_http_serve_ssi(struct mg_connection *c, const char *root,
 // TLS / Security
 
 
+// Available TLS backend libraries
 #define MG_TLS_NONE 0     // No TLS support
 #define MG_TLS_MBED 1     // mbedTLS
 #define MG_TLS_OPENSSL 2  // OpenSSL
@@ -1915,6 +1917,8 @@ void mg_http_serve_ssi(struct mg_connection *c, const char *root,
 #define MG_TLS_CUSTOM 4   // Custom implementation
 
 #ifndef MG_TLS
+// mongoose_config.h setting. Set MG_TLS to one of the MG_TLS_* values above to
+// select a TLS backend. Defaults to MG_TLS_NONE (no TLS).
 #define MG_TLS MG_TLS_NONE
 #endif
 
diff --git a/src/dash.c b/src/dash.c
index bebbe3d1..2fe44207 100644
--- a/src/dash.c
+++ b/src/dash.c
@@ -1,6 +1,5 @@
 #include "dash.h"
 #include "http.h"
-#include "ota.h"
 #include "util.h"
 
 #define MG_NO_CACHE_HEADERS "Cache-Control: no-cache\r\n"
diff --git a/src/tls.h b/src/tls.h
index 1e040b91..6442b38b 100644
--- a/src/tls.h
+++ b/src/tls.h
@@ -1,6 +1,7 @@
 // TLS / Security
 #pragma once
 
+// Available TLS backend libraries
 #define MG_TLS_NONE 0     // No TLS support
 #define MG_TLS_MBED 1     // mbedTLS
 #define MG_TLS_OPENSSL 2  // OpenSSL
@@ -9,6 +10,8 @@
 #define MG_TLS_CUSTOM 4   // Custom implementation
 
 #ifndef MG_TLS
+// mongoose_config.h setting. Set MG_TLS to one of the MG_TLS_* values above to
+// select a TLS backend. Defaults to MG_TLS_NONE (no TLS).
 #define MG_TLS MG_TLS_NONE
 #endif
 
diff --git a/src/util.h b/src/util.h
index 2e6c121d..e8c0aa46 100644
--- a/src/util.h
+++ b/src/util.h
@@ -3,6 +3,7 @@
 #include "arch.h"
 #include "config.h"
 #include "net.h"
+#include "sntp.h"
 #include "str.h"
 
 #if MG_ENABLE_ASSERT