diff --git a/src/propTypes.js b/src/propTypes.js
index c37b748..227df7e 100644
--- a/src/propTypes.js
+++ b/src/propTypes.js
@@ -79,73 +79,75 @@ export default {
   getResizerProps: PropTypes.func,
 
   // Global Column Defaults
-  columns: PropTypes.shape({
-    // Renderers
-    Cell: PropTypes.oneOfType([
-      PropTypes.element,
-      PropTypes.string,
-      PropTypes.func
-    ]),
-    Header: PropTypes.oneOfType([
-      PropTypes.element,
-      PropTypes.string,
-      PropTypes.func
-    ]),
-    Footer: PropTypes.oneOfType([
-      PropTypes.element,
-      PropTypes.string,
-      PropTypes.func
-    ]),
-    Aggregated: PropTypes.oneOfType([
-      PropTypes.element,
-      PropTypes.string,
-      PropTypes.func
-    ]),
-    Pivot: PropTypes.oneOfType([
-      PropTypes.element,
-      PropTypes.string,
-      PropTypes.func
-    ]),
-    PivotValue: PropTypes.oneOfType([
-      PropTypes.element,
-      PropTypes.string,
-      PropTypes.func
-    ]),
-    Expander: PropTypes.oneOfType([
-      PropTypes.element,
-      PropTypes.string,
-      PropTypes.func
-    ]),
-    Filter: PropTypes.oneOfType([PropTypes.element, PropTypes.func]),
+  columns: PropTypes.arrayOf(
+    PropTypes.shape({
+      // Renderers
+      Cell: PropTypes.oneOfType([
+        PropTypes.element,
+        PropTypes.string,
+        PropTypes.func
+      ]),
+      Header: PropTypes.oneOfType([
+        PropTypes.element,
+        PropTypes.string,
+        PropTypes.func
+      ]),
+      Footer: PropTypes.oneOfType([
+        PropTypes.element,
+        PropTypes.string,
+        PropTypes.func
+      ]),
+      Aggregated: PropTypes.oneOfType([
+        PropTypes.element,
+        PropTypes.string,
+        PropTypes.func
+      ]),
+      Pivot: PropTypes.oneOfType([
+        PropTypes.element,
+        PropTypes.string,
+        PropTypes.func
+      ]),
+      PivotValue: PropTypes.oneOfType([
+        PropTypes.element,
+        PropTypes.string,
+        PropTypes.func
+      ]),
+      Expander: PropTypes.oneOfType([
+        PropTypes.element,
+        PropTypes.string,
+        PropTypes.func
+      ]),
+      Filter: PropTypes.oneOfType([PropTypes.element, PropTypes.func]),
 
-    // All Columns
-    sortable: PropTypes.bool, // use table default
-    resizable: PropTypes.bool, // use table default
-    filterable: PropTypes.bool, // use table default
-    show: PropTypes.bool,
-    minWidth: PropTypes.number,
+      // All Columns
+      sortable: PropTypes.bool, // use table default
+      resizable: PropTypes.bool, // use table default
+      filterable: PropTypes.bool, // use table default
+      show: PropTypes.bool,
+      minWidth: PropTypes.number,
 
-    // Cells only
-    className: PropTypes.string,
-    style: PropTypes.object,
-    getProps: PropTypes.func,
+      // Cells only
+      className: PropTypes.string,
+      style: PropTypes.object,
+      getProps: PropTypes.func,
 
-    // Pivot only
-    aggregate: PropTypes.func,
+      // Pivot only
+      aggregate: PropTypes.func,
 
-    // Headers only
-    headerClassName: PropTypes.string,
-    headerStyle: PropTypes.object,
-    getHeaderProps: PropTypes.func,
+      // Headers only
+      headerClassName: PropTypes.string,
+      headerStyle: PropTypes.object,
+      getHeaderProps: PropTypes.func,
 
-    // Footers only
-    footerClassName: PropTypes.string,
-    footerStyle: PropTypes.object,
-    getFooterProps: PropTypes.object,
-    filterMethod: PropTypes.func,
-    filterAll: PropTypes.bool,
-    sortMethod: PropTypes.func
-  }),
+      // Footers only
+      footerClassName: PropTypes.string,
+      footerStyle: PropTypes.object,
+      getFooterProps: PropTypes.object,
+      filterMethod: PropTypes.func,
+      filterAll: PropTypes.bool,
+      sortMethod: PropTypes.func
+    })
+  ),
 
   // Global Expander Column Defaults
   expanderDefaults: PropTypes.shape({