diff --git a/data/README.md b/data/README.md
index c91fe1c5..5d32b75f 100644
--- a/data/README.md
+++ b/data/README.md
@@ -83,18 +83,20 @@ field), where field can `has_id`, `id`, etc.: see
 
 The macro `b4_symbol(NUM, FIELD)` gives access to the following FIELDS:
 
-- `has_id`: 0 or 1.
-
+- `has_id`: 0 or 1
   Whether the symbol has an id.
 
 - `id`: string
   If has_id, the id (prefixed by api.token.prefix if defined), otherwise
-  defined as empty.  Guaranteed to be usable as a C identifier.
+  defined as empty.  Guaranteed to be usable as a C identifier.  This is
+  used to define the token kind (i.e., the enum used by the return value of
+  yylex).
 
-- `tag`: string.
-  A representation of the symbol.  Can be 'foo', 'foo.id', '"foo"' etc.
+- `tag`: string
+  A human representation of the symbol.  Can be 'foo', 'foo.id', '"foo"' etc.
 
 - `user_number`: integer
+  The code associated to the `id`.
   The external number as used by yylex.  Can be ASCII code when a character,
   some number chosen by bison, or some user number in the case of
   %token FOO <NUM>.  Corresponds to yychar in yacc.c.
@@ -102,7 +104,12 @@ The macro `b4_symbol(NUM, FIELD)` gives access to the following FIELDS:
 - `is_token`: 0 or 1
   Whether this is a terminal symbol.
 
+- `kind`: string
+  The symbol kind, i.e., the enumerator of this symbol (token or nonterminal)
+  which is mapping to its `number`.
+
 - `number`: integer
+  The code associated to the `kind`.
   The internal number (computed from the external number by yytranslate).
   Corresponds to yytoken in yacc.c.  This is the same number that serves as
   key in b4_symbol(NUM, FIELD).
diff --git a/data/skeletons/bison.m4 b/data/skeletons/bison.m4
index 1bd30dd1..480872fd 100644
--- a/data/skeletons/bison.m4
+++ b/data/skeletons/bison.m4
@@ -405,13 +405,13 @@ m4_define([_b4_symbol],
           [__b4_symbol([$1], [$2])])])
 
 
-# b4_symbol_sid(NUM)
-# ------------------
-# Build the symbol ID based for this symbol.  It must always exist,
+# b4_symbol_kind(NUM)
+# -------------------
+# Build the name of the kind of this symbol.  It must always exist,
 # otherwise some symbols might not be represented in the enum, which
 # might be compiled into too small a type to contain all the symbol
 # numbers.
-m4_define([b4_symbol_sid],
+m4_define([b4_symbol_kind],
 [m4_case([$1],
   [-2],                           [[YYSYMBOL_YYEMPTY]],
   [0],                            [[YYSYMBOL_YYEOF]],
@@ -433,7 +433,7 @@ m4_define([b4_symbol],
 [m4_case([$2],
          [id],    [m4_do([b4_percent_define_get([api.token.prefix])],
                          [_b4_symbol([$1], [id])])],
-         [sid],   [b4_symbol_sid([$1])],
+         [kind],  [b4_symbol_kind([$1])],
          [_b4_symbol($@)])])
 
 
diff --git a/data/skeletons/c++.m4 b/data/skeletons/c++.m4
index 720977b0..ac074f4b 100644
--- a/data/skeletons/c++.m4
+++ b/data/skeletons/c++.m4
@@ -192,7 +192,7 @@ m4_define([b4_declare_symbol_enum],
     {
       ]m4_join([,
       ],
-               ]b4_symbol_sid([-2])[ = -2,
+               ]b4_symbol_kind([-2])[ = -2,
                b4_symbol_map([b4_symbol_enum]),
                [YYNTOKENS = ]b4_tokens_number[ ///< Number of tokens.])[
     };
diff --git a/data/skeletons/c.m4 b/data/skeletons/c.m4
index 2c134365..aeafea4e 100644
--- a/data/skeletons/c.m4
+++ b/data/skeletons/c.m4
@@ -495,9 +495,9 @@ m4_define([b4_symbol_translate],
 # --------------------------
 # Output the definition of this symbol as an enum.
 m4_define([b4_symbol_enum],
-[m4_ifval(b4_symbol([$1], [sid]),
+[m4_ifval(b4_symbol([$1], [kind]),
          [m4_format([[%s = %s]],
-                    b4_symbol([$1], [sid]),
+                    b4_symbol([$1], [kind]),
                     b4_symbol([$1], [number]))])])
 
 
@@ -512,7 +512,7 @@ enum yysymbol_kind_t
 {
   ]m4_join([,
   ],
-           ]b4_symbol_sid([-2])[ = -2,
+           ]b4_symbol_kind([-2])[ = -2,
            b4_symbol_map([b4_symbol_enum]))[
 };
 typedef enum yysymbol_kind_t yysymbol_kind_t;
diff --git a/data/skeletons/d.m4 b/data/skeletons/d.m4
index b8862cf7..fefe74a1 100644
--- a/data/skeletons/d.m4
+++ b/data/skeletons/d.m4
@@ -181,9 +181,9 @@ b4_symbol_foreach([b4_token_enum])
 # --------------------------
 # Output the definition of this symbol as an enum.
 m4_define([b4_symbol_enum],
-[m4_ifval(b4_symbol([$1], [sid]),
+[m4_ifval(b4_symbol([$1], [kind]),
          [m4_format([[%s = %s]],
-                    b4_symbol([$1], [sid]),
+                    b4_symbol([$1], [kind]),
                     b4_symbol([$1], [number]))])])
 
 
@@ -198,7 +198,7 @@ m4_define([b4_declare_symbol_enum],
   {
     ]m4_join([,
     ],
-             ]b4_symbol_sid([-2])[ = -2,
+             ]b4_symbol_kind([-2])[ = -2,
              b4_symbol_map([b4_symbol_enum]))[
   };
 ]])])
diff --git a/data/skeletons/java.m4 b/data/skeletons/java.m4
index 47e745ae..3733f261 100644
--- a/data/skeletons/java.m4
+++ b/data/skeletons/java.m4
@@ -157,9 +157,9 @@ b4_symbol_foreach([b4_token_enum])])])
 # --------------------------
 # Output the definition of this symbol as an enum.
 m4_define([b4_symbol_enum],
-[m4_ifval(b4_symbol([$1], [sid]),
+[m4_ifval(b4_symbol([$1], [kind]),
          [m4_format([[%s(%s)]],
-                    b4_symbol([$1], [sid]),
+                    b4_symbol([$1], [kind]),
                     b4_symbol([$1], [number]))])])
 
 
@@ -171,7 +171,7 @@ m4_define([b4_declare_symbol_enum],
   {
     ]m4_join([,
     ],
-             ]b4_symbol_sid([-2])[(-2),
+             ]b4_symbol_kind([-2])[(-2),
              b4_symbol_map([b4_symbol_enum]))[;
 
     private final int code_;
@@ -181,7 +181,7 @@ m4_define([b4_declare_symbol_enum],
     }
 
     private static final SymbolKind[] values_ = {
-        ]m4_map_args_sep([b4_symbol_sid(], [)], [,
+        ]m4_map_args_sep([b4_symbol_kind(], [)], [,
         ], b4_symbol_numbers)[
     };