diff --git a/basic.js b/basic.js
index a58b55f..e2162bd 100644
--- a/basic.js
+++ b/basic.js
@@ -1895,7 +1895,7 @@ this.basic = (function() {
                 trailing = false;
                 args.push('lib.comma()');
               } else if (test('reserved', kws.SPC) || test('reserved', kws.TAB)) {
-                trailing = true;
+                trailing = false;
                 keyword = match('reserved');
                 match("operator", "(");
                 expr = parseNumericExpression();
diff --git a/reference.html b/reference.html
index c11bbe7..b993f49 100644
--- a/reference.html
+++ b/reference.html
@@ -89,6 +89,9 @@ This is intended as a quick reference for the <a href="./">Applesoft BASIC in Ja
 <dl>
   <dt>PRINT <var>expr</var> [ [;,] <var>expr</var> ... ] [;]<dd>Output text. <code>;</code> concatenates,
       <code>,</code> advances to next tab stop. A trailing <code>;</code> suppresses line break.
+      <var>expr</var> can include <code>SPC(<var>aexpr</var>)</code> to advance by
+      multiple spaces, or <code>TAB(<var>aexpr</var>)</code> to advance by multiple tab stops.
+
   <dt>INPUT [<var>string</var> ;] <var>var</var> [, <var>var</var> ...]<dd>Read line of comma-delimited input, with optional prompt
   <dt>GET <var>var</var><dd>Read single key
   <dt>HOME<dd>Clear text display
diff --git a/samples/sample.unittests.txt b/samples/sample.unittests.txt
index 3afb5cc..2ee73a6 100644
--- a/samples/sample.unittests.txt
+++ b/samples/sample.unittests.txt
@@ -358,15 +358,15 @@
 
 4140 T$ = "SPC Operator" :
 : SX = PEEK(36) : SY = PEEK(37)
-: VTAB 23 : HTAB 1 : PRINT "abc";SPC(10); : T = PEEK(36)
-: VTAB 23 : HTAB 1 : PRINT SPC(40);
+: VTAB 23 : HTAB 1 : PRINT "abc";SPC(10) : T = PEEK(36)
+: VTAB 23 : HTAB 1 : PRINT SPC(40)
 : POKE 36, SX : POKE 37, SY
 : S = (T = 13) : GOSUB 1
 
 4150 T$ = "TAB Operator" :
 : SX = PEEK(36) : SY = PEEK(37)
-: VTAB 23 : HTAB 1 : PRINT "abc";TAB(10); : T = PEEK(36)
-: VTAB 23 : HTAB 1 : PRINT SPC(40);
+: VTAB 23 : HTAB 1 : PRINT "abc";TAB(10) : T = PEEK(36)
+: VTAB 23 : HTAB 1 : PRINT SPC(40)
 : POKE 36, SX : POKE 37, SY
 : S = (T = 9) : GOSUB 1