diff --git a/LUA_API.rst b/LUA_API.rst
index 1a38c4edc..050714c72 100644
--- a/LUA_API.rst
+++ b/LUA_API.rst
@@ -209,7 +209,7 @@ Implemented features:
 * ``ref:insert(index,item)``
 
   Inserts a new item at the specified index. To add at the end,
-  use ``#ref`` as index.
+  use ``#ref``, or just ``'#'`` as index.
 
 * ``ref:erase(index)``
 
diff --git a/Lua API.html b/Lua API.html
index d5d849d91..cbf35f0eb 100644
--- a/Lua API.html	
+++ b/Lua API.html	
@@ -516,7 +516,7 @@ possible.</p>
 </li>
 <li><p class="first"><tt class="docutils literal">ref:insert(index,item)</tt></p>
 <p>Inserts a new item at the specified index. To add at the end,
-use <tt class="docutils literal">#ref</tt> as index.</p>
+use <tt class="docutils literal">#ref</tt>, or just <tt class="docutils literal">'#'</tt> as index.</p>
 </li>
 <li><p class="first"><tt class="docutils literal">ref:erase(index)</tt></p>
 <p>Removes the element at the given valid index.</p>
diff --git a/library/LuaTypes.cpp b/library/LuaTypes.cpp
index c5ffe0f6b..2cfe8a84e 100644
--- a/library/LuaTypes.cpp
+++ b/library/LuaTypes.cpp
@@ -733,8 +733,18 @@ static int lookup_container_field(lua_State *state, int field, const char *mode
  * Index verification: number and in range.
  */
 static int check_container_index(lua_State *state, int len,
-                                 int fidx, int iidx, const char *mode)
+                                 int fidx, int iidx, const char *mode,
+                                 bool is_insert = false)
 {
+    if (is_insert && len >= 0)
+    {
+        if (lua_type(state, iidx) == LUA_TSTRING
+            && strcmp(lua_tostring(state, iidx), "#") == 0)
+            return len;
+
+        len++;
+    }
+
     if (!lua_isnumber(state, iidx))
         field_error(state, fidx, "invalid index", mode);
 
@@ -867,8 +877,7 @@ static int method_container_insert(lua_State *state)
 
     auto id = (container_identity*)lua_touserdata(state, UPVAL_CONTAINER_ID);
     int len = id->lua_item_count(state, ptr, container_identity::COUNT_LEN);
-    if (len >= 0) len++;
-    int idx = check_container_index(state, len, UPVAL_METHOD_NAME, 2, "call");
+    int idx = check_container_index(state, len, UPVAL_METHOD_NAME, 2, "call", true);
 
     if (!id->lua_insert(state, UPVAL_METHOD_NAME, ptr, idx, 3))
         field_error(state, UPVAL_METHOD_NAME, "not supported", "call");