diff --git a/epan/wslua/wslua_dumper.c b/epan/wslua/wslua_dumper.c
index 9a7112c90e..530504ed15 100644
--- a/epan/wslua/wslua_dumper.c
+++ b/epan/wslua/wslua_dumper.c
@@ -20,7 +20,11 @@
 
    The classes/functions defined in this module are for using a `Dumper` object to
    make Wireshark save a capture file to disk. `Dumper` represents Wireshark's built-in
-   file format writers (see the `wtap_filetypes` table in `init.lua`).
+   file format writers (see the `wtap_name_to_file_type_subtype` function).
+
+   (The `wtap_filetypes` table in `init.lua` is deprecated, and should
+   only be used in code that must run on Wireshark 3.4.3 and earlier 3.4
+   releases or in Wireshark 3.2.11 and earlier 3.2.x releases.)
 
    To have a Lua script create its own file format writer, see the chapter titled
    "Custom file format reading/writing".
@@ -197,7 +201,12 @@ WSLUA_CONSTRUCTOR Dumper_new(lua_State* L) {
      `Dumper:new_for_current()` will probably be a better choice.
     */
 #define WSLUA_ARG_Dumper_new_FILENAME 1 /* The name of the capture file to be created. */
-#define WSLUA_OPTARG_Dumper_new_FILETYPE 2 /* The type of the file to be created - a number entry from the `wtap_filetypes` table in `init.lua`. */
+#define WSLUA_OPTARG_Dumper_new_FILETYPE 2 /* The type of the file to be created - a number returned by `wtap_name_to_file_type_subtype()`.
+                                              (The `wtap_filetypes` table in `init.lua`
+                                              is deprecated, and should only be used
+                                              in code that must run on Wireshark 3.4.3 and earlier 3.4 releases
+                                              or in Wireshark 3.2.11 and earlier
+                                              3.2.x releases.) */
 #define WSLUA_OPTARG_Dumper_new_ENCAP 3 /* The encapsulation to be used in the file to be created - a number entry from the `wtap_encaps` table in `init.lua`. */
     Dumper d;
     const char* fname = luaL_checkstring(L,WSLUA_ARG_Dumper_new_FILENAME);
diff --git a/epan/wslua/wslua_wtap.c b/epan/wslua/wslua_wtap.c
index bda17e32d4..68914ddcf6 100644
--- a/epan/wslua/wslua_wtap.c
+++ b/epan/wslua/wslua_wtap.c
@@ -27,7 +27,7 @@ WSLUA_FUNCTION wslua_wtap_file_type_subtype_description(lua_State* LS) {
 
     @since 3.2.12, 3.4.4
     */
-#define WSLUA_ARG_file_type_subtype_description_FILETYPE 1 /* The type for which the description is to be fetched - a number entry from the `wtap_filetypes` table in `init.lua`. */
+#define WSLUA_ARG_file_type_subtype_description_FILETYPE 1 /* The type for which the description is to be fetched - a number returned by `wtap_name_to_file_type_subtype()`. */
     lua_Number filetype = luaL_checknumber(LS,WSLUA_ARG_file_type_subtype_description_FILETYPE);
     /* wtap_file_type_subtype_string()'s name isn't really descriptive. */
     if (filetype > INT_MAX) {
@@ -40,7 +40,7 @@ WSLUA_FUNCTION wslua_wtap_file_type_subtype_description(lua_State* LS) {
         else
             lua_pushstring(LS,str);
     }
-    WSLUA_RETURN(1); /* The description of the file type with that filetype value, or nul if there is no such file type. */
+    WSLUA_RETURN(1); /* The description of the file type with that filetype value, or nil if there is no such file type. */
 }
 
 WSLUA_FUNCTION wslua_wtap_file_type_subtype_name(lua_State* LS) {
@@ -50,7 +50,7 @@ WSLUA_FUNCTION wslua_wtap_file_type_subtype_name(lua_State* LS) {
 
     @since 3.2.12, 3.4.4
     */
-#define WSLUA_ARG_file_type_subtype_name_FILETYPE 1 /* The type for which the name is to be fetched - a number entry from the `wtap_filetypes` table in `init.lua`. */
+#define WSLUA_ARG_file_type_subtype_name_FILETYPE 1 /* The type for which the name is to be fetched - a number returned by `wtap_name_to_file_type_subtype()`. */
     lua_Number filetype = luaL_checknumber(LS,WSLUA_ARG_file_type_subtype_name_FILETYPE);
     /* wtap_file_type_subtype_string()'s name isn't really descriptive. */
     if (filetype > INT_MAX) {
@@ -63,7 +63,7 @@ WSLUA_FUNCTION wslua_wtap_file_type_subtype_name(lua_State* LS) {
         else
            lua_pushstring(LS,str);
     }
-    WSLUA_RETURN(1); /* The name of the file type with that filetype value, or nul if there is no such file type. */
+    WSLUA_RETURN(1); /* The name of the file type with that filetype value, or nil if there is no such file type. */
 }
 
 WSLUA_FUNCTION wslua_wtap_name_to_file_type_subtype(lua_State* LS) {
@@ -73,7 +73,7 @@ WSLUA_FUNCTION wslua_wtap_name_to_file_type_subtype(lua_State* LS) {
 
     @since 3.2.12, 3.4.4
     */
-#define WSLUA_ARG_name_to_file_type_subtype_NAME 1 /* A timestamp value to convert. */
+#define WSLUA_ARG_name_to_file_type_subtype_NAME 1 /* The name of a file type. */
     const char* name = luaL_checkstring(LS,WSLUA_ARG_name_to_file_type_subtype_NAME);
     /* wtap_short_string_to_file_type_subtype()'s name isn't really descriptive. */
     lua_Number filetype = wtap_short_string_to_file_type_subtype(name);