diff --git a/src/option.c b/src/option.c
index f1fcd69..b633466 100644
--- a/src/option.c
+++ b/src/option.c
@@ -4352,7 +4352,7 @@
 		    p = find_termcode(key_name);
 		    if (p == NULL)
 		    {
-			errmsg = (char_u *)N_("E518: Unknown option");
+			errmsg = (char_u *)N_("E846: Key code not set");
 			goto skip;
 		    }
 		    else
@@ -4700,8 +4700,8 @@
 						|| s[i] == ','
 						|| s[i] == NUL))
 					break;
-				    /* Count backspaces.  Only a comma with an
-				     * even number of backspaces before it is
+				    /* Count backslashes.  Only a comma with an
+				     * even number of backslashes before it is
 				     * recognized as a separator */
 				    if (s > origval && s[-1] == '\\')
 					++bs;