diff --git a/src/optionstr.c b/src/optionstr.c
index 521242d..91d0a69 100644
--- a/src/optionstr.c
+++ b/src/optionstr.c
@@ -34,10 +34,11 @@
 				 "undo", "jump", NULL};
 #endif
 #ifdef FEAT_SESSION
-// Also used for 'viewoptions'!
+// Also used for 'viewoptions'!  Keep in sync with SSOP_ flags.
 static char *(p_ssop_values[]) = {"buffers", "winpos", "resize", "winsize",
     "localoptions", "options", "help", "blank", "globals", "slash", "unix",
-    "sesdir", "curdir", "folds", "cursor", "tabpages", "terminal", NULL};
+    "sesdir", "curdir", "folds", "cursor", "tabpages", "terminal", "skiprtp",
+    NULL};
 #endif
 // Keep in sync with SWB_ flags in option.h
 static char *(p_swb_values[]) = {"useopen", "usetab", "split", "newtab", "vsplit", "uselast", NULL};