diff --git a/README.md b/README.md
index 4b0d3e6..24be21a 100644
--- a/README.md
+++ b/README.md
@@ -147,6 +147,7 @@ The caret (`^`) comparison operator is for major level changes. This is useful
 when comparisons of API versions as a major change is API breaking. For example,
 
 * `^1.2.3` is equivalent to `>= 1.2.3, < 2.0.0`
+* `^0.0.1` is equivalent to `>= 0.0.1, < 1.0.0`
 * `^1.2.x` is equivalent to `>= 1.2.0, < 2.0.0`
 * `^2.3` is equivalent to `>= 2.3, < 3`
 * `^2.x` is equivalent to `>= 2.0.0, < 3`
diff --git a/constraints_test.go b/constraints_test.go
index fed9329..ca9b691 100644
--- a/constraints_test.go
+++ b/constraints_test.go
@@ -354,6 +354,7 @@ func TestConstraintsValidate(t *testing.T) {
 		{"^1.x", "1.1.1", true},
 		{"^2.x", "1.1.1", false},
 		{"^1.x", "2.1.1", false},
+		{"^0.0.1", "0.1.3", true},
 		{"~*", "2.1.1", true},
 		{"~1", "2.1.1", false},
 		{"~1", "1.3.5", true},