diff --git a/src/lchttppost.c b/src/lchttppost.c
index 65c4ff0..0200339 100644
--- a/src/lchttppost.c
+++ b/src/lchttppost.c
@@ -569,6 +569,7 @@ static const struct luaL_Reg lcurl_hpost_methods[] = {
   {"get",                  lcurl_hpost_get                       },
   {"free",                 lcurl_hpost_free                      },
   {"__gc",                 lcurl_hpost_free                      },
+  {"__tostring",           lcurl_hpost_to_s                      },
 
   {NULL,NULL}
 };
diff --git a/src/lcurl.c b/src/lcurl.c
index eca1f10..512fe0c 100644
--- a/src/lcurl.c
+++ b/src/lcurl.c
@@ -187,6 +187,12 @@ static const char* LCURL_USERVAL  = "LCURL Uservalues";
 
 static int luaopen_lcurl_(lua_State *L, const struct luaL_Reg *func){
   if(!LCURL_INIT){
+    /* Note from libcurl documentation.
+     *
+     * The environment it sets up is constant for the life of the program
+     * and is the same for every program, so multiple calls have the same
+     * effect as one call. ... This function is not thread safe.
+     */
     curl_global_init(CURL_GLOBAL_DEFAULT);
     LCURL_INIT = 1;
   }