diff --git a/src/structs.h b/src/structs.h
index 9968e92..8fb14d7 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2266,6 +2266,10 @@
 #define SYNSPL_TOP	1	// spell check toplevel text
 #define SYNSPL_NOTOP	2	// don't spell check toplevel text
 
+// values for b_syn_foldlevel: how to compute foldlevel on a line
+#define SYNFLD_START	0	// use level of item at start of line
+#define SYNFLD_MINIMUM	1	// use lowest local minimum level on line
+
 // avoid #ifdefs for when b_spell is not available
 #ifdef FEAT_SPELL
 # define B_SPELL(buf)  ((buf)->b_spell)
@@ -2360,6 +2364,7 @@
     int		b_syn_slow;		// TRUE when 'redrawtime' reached
 # endif
     int		b_syn_ic;		// ignore case for :syn cmds
+    int		b_syn_foldlevel;	// how to compute foldlevel on a line
     int		b_syn_spell;		// SYNSPL_ values
     garray_T	b_syn_patterns;		// table for syntax patterns
     garray_T	b_syn_clusters;		// table for syntax clusters