diff --git a/src/structs.h b/src/structs.h
index 9260151..fb76df9 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -1000,6 +1000,58 @@
 #endif // FEAT_SYN_HL
 
 /*
+ * Structure that stores information about a highlight group.
+ * The ID of a highlight group is also called group ID.  It is the index in
+ * the highlight_ga array PLUS ONE.
+ */
+typedef struct
+{
+    char_u	*sg_name;	// highlight group name
+    char_u	*sg_name_u;	// uppercase of sg_name
+    int		sg_cleared;	// "hi clear" was used
+// for normal terminals
+    int		sg_term;	// "term=" highlighting attributes
+    char_u	*sg_start;	// terminal string for start highl
+    char_u	*sg_stop;	// terminal string for stop highl
+    int		sg_term_attr;	// Screen attr for term mode
+// for color terminals
+    int		sg_cterm;	// "cterm=" highlighting attr
+    int		sg_cterm_bold;	// bold attr was set for light color
+    int		sg_cterm_fg;	// terminal fg color number + 1
+    int		sg_cterm_bg;	// terminal bg color number + 1
+    int		sg_cterm_attr;	// Screen attr for color term mode
+// for when using the GUI
+#if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
+    guicolor_T	sg_gui_fg;	// GUI foreground color handle
+    guicolor_T	sg_gui_bg;	// GUI background color handle
+#endif
+#ifdef FEAT_GUI
+    guicolor_T	sg_gui_sp;	// GUI special color handle
+    GuiFont	sg_font;	// GUI font handle
+#ifdef FEAT_XFONTSET
+    GuiFontset	sg_fontset;	// GUI fontset handle
+#endif
+    char_u	*sg_font_name;  // GUI font or fontset name
+    int		sg_gui_attr;    // Screen attr for GUI mode
+#endif
+#if defined(FEAT_GUI) || defined(FEAT_EVAL)
+// Store the sp color name for the GUI or synIDattr()
+    int		sg_gui;		// "gui=" highlighting attributes
+    char_u	*sg_gui_fg_name;// GUI foreground color name
+    char_u	*sg_gui_bg_name;// GUI background color name
+    char_u	*sg_gui_sp_name;// GUI special color name
+#endif
+    int		sg_link;	// link to this highlight group ID
+    int		sg_set;		// combination of SG_* flags
+#ifdef FEAT_EVAL
+    sctx_T	sg_script_ctx;	// script in which the group was last set
+#endif
+} hl_group_T;
+
+#define HL_TABLE()	((hl_group_T *)((highlight_ga.ga_data)))
+#define MAX_HL_ID       20000	// maximum value for a highlight ID.
+
+/*
  * Structure shared between syntax.c, screen.c and gui_x11.c.
  */
 typedef struct attr_entry