diff --git a/HTMLKit.playground/Pages/CSS Selectors.xcplaygroundpage/Contents.swift b/HTMLKit.playground/Pages/CSS Selectors.xcplaygroundpage/Contents.swift
index a363d85..3a4b40f 100644
--- a/HTMLKit.playground/Pages/CSS Selectors.xcplaygroundpage/Contents.swift	
+++ b/HTMLKit.playground/Pages/CSS Selectors.xcplaygroundpage/Contents.swift	
@@ -46,7 +46,7 @@ hasAdjacentHeader = document.elementsMatchingSelector(generalSiblingSelector(typ
 nonParagraphChildOfDiv = document.elementsMatchingSelector(
 	allOf([
 		childOfElementSelector(typeSelector("div")),
-		nay(typeSelector("p"))
+		not(typeSelector("p"))
 	])
 )
 
@@ -66,8 +66,8 @@ secondOfType = firstDivElement.elementsMatchingSelector(nthOfTypeSelector(CSSNth
 var notParagraphAndNotDiv = firstDivElement.querySelectorAll(":not(p):not(div)")
 notParagraphAndNotDiv = firstDivElement.elementsMatchingSelector(
 	allOf([
-		nay(typeSelector("p")),
-		nay(typeSelector("div"))
+		not(typeSelector("p")),
+		not(typeSelector("div"))
 	])
 )
 
diff --git a/HTMLKit/CSSSelectorParser.m b/HTMLKit/CSSSelectorParser.m
index 6297ccf..b3f0f63 100644
--- a/HTMLKit/CSSSelectorParser.m
+++ b/HTMLKit/CSSSelectorParser.m
@@ -332,7 +332,7 @@
 			[self emitError:error reason:@"Expected closing right parenthesis ')'"];
 		}
 
-		return nay(subSelector);
+		return not(subSelector);
 	} else if ([pseudoClass isEqualToAny:@"lt", @"gt", @"eq", nil]) {
 		[_inputStream consumeWhitespace];
 		if (![_inputStream consumeCharacter:LEFT_PARENTHESIS]) {
diff --git a/HTMLKit/CSSSelectors.h b/HTMLKit/CSSSelectors.h
index 307a111..4d6d309 100644
--- a/HTMLKit/CSSSelectors.h
+++ b/HTMLKit/CSSSelectors.h
@@ -220,7 +220,7 @@ extern CSSSelector * generalSiblingSelector(CSSSelector *selector);
  @param selector The selector which should be negated.
  @returns A negation selector.
  */
-extern CSSSelector * nay(CSSSelector *selector);
+extern CSSSelector * not(CSSSelector *selector);
 
 /**
  CSS has-descendant selector, e.g. 'div:has(p)'
diff --git a/HTMLKit/CSSSelectors.m b/HTMLKit/CSSSelectors.m
index d4e864f..55d9b0b 100644
--- a/HTMLKit/CSSSelectors.m
+++ b/HTMLKit/CSSSelectors.m
@@ -140,7 +140,7 @@ CSSSelector * generalSiblingSelector(CSSSelector *selector)
 
 #pragma mark - Pseudo Functions
 
-CSSSelector * nay(CSSSelector *selector)
+CSSSelector * not(CSSSelector *selector)
 {
 	return [CSSPseudoFunctionSelector notSelector:selector];
 }
diff --git a/HTMLKit/CSSStructuralPseudoSelectors.m b/HTMLKit/CSSStructuralPseudoSelectors.m
index 26ef4a7..af99dea 100644
--- a/HTMLKit/CSSStructuralPseudoSelectors.m
+++ b/HTMLKit/CSSStructuralPseudoSelectors.m
@@ -183,7 +183,7 @@ CSSSelector * enabledSelector()
 									typeSelector(@"menuitem"),
 									typeSelector(@"fieldset"),
 									]);
-	return namedPseudoSelector(@"enabled", allOf(@[candiate, nay(disabledSelector())]));
+	return namedPseudoSelector(@"enabled", allOf(@[candiate, not(disabledSelector())]));
 }
 
 CSSSelector * disabledSelector()
@@ -206,7 +206,7 @@ CSSSelector * disabledSelector()
 												]),
 										allOf(@[
 												descendantOfElementSelector(disabledFieldset),
-												nay(firstLegendDecendantDisabledFieldSet)
+												not(firstLegendDecendantDisabledFieldSet)
 												])
 										]);
 
@@ -249,7 +249,7 @@ CSSSelector * optionalSelector()
 									 typeSelector(@"select"),
 									 typeSelector(@"textarea")
 									 ]);
-	CSSSelector *noAttribute = nay(hasAttributeSelector(@"required"));
+	CSSSelector *noAttribute = not(hasAttributeSelector(@"required"));
 
 	return namedPseudoSelector(@"optional", allOf(@[candidate, noAttribute]));
 }