diff --git a/client.go b/client.go
index 91059f7..4447633 100644
--- a/client.go
+++ b/client.go
@@ -551,7 +551,7 @@ func baseRetryPolicy(resp *http.Response, err error) (bool, error) {
 func DefaultBackoff(min, max time.Duration, attemptNum int, resp *http.Response) time.Duration {
 	if resp != nil {
 		if resp.StatusCode == http.StatusTooManyRequests || resp.StatusCode == http.StatusServiceUnavailable {
-			if sleep, ok := parseRetryAfterHeader(resp.Header["Retry-After"]); ok {
+			if sleep, ok := ParseRetryAfterHeader(resp.Header["Retry-After"]); ok {
 				return sleep
 			}
 		}
@@ -565,7 +565,7 @@ func DefaultBackoff(min, max time.Duration, attemptNum int, resp *http.Response)
 	return sleep
 }
 
-// parseRetryAfterHeader parses the Retry-After header and returns the
+// ParseRetryAfterHeader parses the Retry-After header and returns the
 // delay duration according to the spec: https://httpwg.org/specs/rfc7231.html#header.retry-after
 // The bool returned will be true if the header was successfully parsed.
 // Otherwise, the header was either not present, or was not parseable according to the spec.
@@ -575,7 +575,7 @@ func DefaultBackoff(min, max time.Duration, attemptNum int, resp *http.Response)
 // Examples:
 // * Retry-After: Fri, 31 Dec 1999 23:59:59 GMT
 // * Retry-After: 120
-func parseRetryAfterHeader(headers []string) (time.Duration, bool) {
+func ParseRetryAfterHeader(headers []string) (time.Duration, bool) {
 	if len(headers) == 0 || headers[0] == "" {
 		return 0, false
 	}
@@ -647,7 +647,7 @@ func LinearJitterBackoff(min, max time.Duration, attemptNum int, resp *http.Resp
 func RateLimitLinearJitterBackoff(min, max time.Duration, attemptNum int, resp *http.Response) time.Duration {
 	if resp != nil {
 		if resp.StatusCode == http.StatusTooManyRequests || resp.StatusCode == http.StatusServiceUnavailable {
-			if sleep, ok := parseRetryAfterHeader(resp.Header["Retry-After"]); ok {
+			if sleep, ok := ParseRetryAfterHeader(resp.Header["Retry-After"]); ok {
 				return sleep
 			}
 		}
diff --git a/client_test.go b/client_test.go
index 8c5c783..9a38cab 100644
--- a/client_test.go
+++ b/client_test.go
@@ -838,7 +838,7 @@ func TestParseRetryAfterHeader(t *testing.T) {
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			sleep, ok := parseRetryAfterHeader(test.headers)
+			sleep, ok := ParseRetryAfterHeader(test.headers)
 			if ok != test.ok {
 				t.Fatalf("expected ok=%t, got ok=%t", test.ok, ok)
 			}