From ceb8a492b116f966e780d0ff4992ee0919963bd0 Mon Sep 17 00:00:00 2001
From: Jacob Evans <jacob@dekz.net>
Date: Thu, 18 Jan 2018 18:59:47 +1100
Subject: Should not -> cannot

---
 packages/assert/src/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/assert/src/index.ts b/packages/assert/src/index.ts
index 015ffe579..0ea666629 100644
--- a/packages/assert/src/index.ts
+++ b/packages/assert/src/index.ts
@@ -13,7 +13,7 @@ export const assert = {
     isValidBaseUnitAmount(variableName: string, value: BigNumber) {
         assert.isBigNumber(variableName, value);
         const isNegative = value.lessThan(0);
-        this.assert(!isNegative, `${variableName} should not be a negative number, found value: ${value.toNumber()}` );
+        this.assert(!isNegative, `${variableName} cannot be a negative number, found value: ${value.toNumber()}` );
         const hasDecimals = value.decimalPlaces() !== 0;
         this.assert(
             !hasDecimals,
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