diff --git a/src/option.c b/src/option.c
index f93d839..c9cad32 100644
--- a/src/option.c
+++ b/src/option.c
@@ -207,6 +207,7 @@
 # define PV_LBR		OPT_WIN(WV_LBR)
 #endif
 #define PV_NU		OPT_WIN(WV_NU)
+#define PV_RNU		OPT_WIN(WV_RNU)
 #ifdef FEAT_LINEBREAK
 # define PV_NUW		OPT_WIN(WV_NUW)
 #endif
@@ -2015,6 +2016,9 @@
 			    (char_u *)NULL, PV_NONE,
 #endif
 			    {(char_u *)2000L, (char_u *)0L} SCRIPTID_INIT},
+    {"relativenumber", "rnu", P_BOOL|P_VI_DEF|P_RWIN,
+			    (char_u *)VAR_WIN, PV_RNU,
+			    {(char_u *)FALSE, (char_u *)0L} SCRIPTID_INIT},
     {"remap",	    NULL,   P_BOOL|P_VI_DEF,
 			    (char_u *)&p_remap, PV_NONE,
 			    {(char_u *)TRUE, (char_u *)0L} SCRIPTID_INIT},
@@ -7230,10 +7234,18 @@
 
     /* 'list', 'number' */
     else if ((int *)varp == &curwin->w_p_list
-	  || (int *)varp == &curwin->w_p_nu)
+	  || (int *)varp == &curwin->w_p_nu
+	  || (int *)varp == &curwin->w_p_rnu)
     {
 	if (curwin->w_curswant != MAXCOL)
 	    curwin->w_set_curswant = TRUE;
+
+	/* If 'number' is set, reset 'relativenumber'. */
+	/* If 'relativenumber' is set, reset 'number'. */
+	if ((int *)varp == &curwin->w_p_nu && curwin->w_p_nu)
+	    curwin->w_p_rnu = FALSE;
+	if ((int *)varp == &curwin->w_p_rnu && curwin->w_p_rnu)
+	    curwin->w_p_nu = FALSE;
     }
 
     else if ((int *)varp == &curbuf->b_p_ro)
@@ -9232,6 +9244,7 @@
 	case PV_FMR:	return (char_u *)&(curwin->w_p_fmr);
 #endif
 	case PV_NU:	return (char_u *)&(curwin->w_p_nu);
+	case PV_RNU:	return (char_u *)&(curwin->w_p_rnu);
 #ifdef FEAT_LINEBREAK
 	case PV_NUW:	return (char_u *)&(curwin->w_p_nuw);
 #endif
@@ -9417,6 +9430,7 @@
 #endif
     to->wo_list = from->wo_list;
     to->wo_nu = from->wo_nu;
+    to->wo_rnu = from->wo_rnu;
 #ifdef FEAT_LINEBREAK
     to->wo_nuw = from->wo_nuw;
 #endif