diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 51cf38e5f41..6ba98ba2146 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -2503,7 +2503,7 @@ module ts {
         }
 
         // For a type parameter, return the base constraint of the type parameter. For the string, number,
-        // boolean, and symbol primitive types, return the corresponding object types.Otherwise return the
+        // boolean, and symbol primitive types, return the corresponding object types. Otherwise return the
         // type itself. Note that the apparent type of a union type is the union type itself.
         function getApparentType(type: Type): Type {
             if (type.flags & TypeFlags.TypeParameter) {
@@ -5538,7 +5538,7 @@ module ts {
             if (!links.resolvedType) {
                 links.resolvedType = checkExpression(node.expression);
 
-                // This will allow types number, string, Symbol or any. It will also allow enums, the unknown
+                // This will allow types number, string, symbol or any. It will also allow enums, the unknown
                 // type, and any union of these types (like string | number).
                 if (!isTypeOfKind(links.resolvedType, TypeFlags.Any | TypeFlags.NumberLike | TypeFlags.StringLike | TypeFlags.ESSymbol)) {
                     error(node, Diagnostics.A_computed_property_name_must_be_of_type_string_number_symbol_or_any);