diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index e66a43e0aeb..0ccb7253331 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -1602,7 +1602,8 @@ namespace ts {
     }
 
     /**
-     * Compare two values for their order relative to each other.
+     * Compare two numeric values for their order relative to each other.
+     * To compare strings, use any of the `compareStrings` functions.
      */
     export function compareValues(a: number, b: number) {
         return compareComparableValues(a, b);