diff --git a/package.json b/package.json
index affdf5a..f6d62dd 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "screenshotone-errors",
   "homepage": "https://screenshotone.com",
-  "version": "1.0.17",
+  "version": "1.0.18",
   "description": "Errors produced by the ScreenshotOne API.",
   "repository": {
     "type": "git",
diff --git a/src/main.ts b/src/main.ts
index 3a17df6..d3eb61e 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -18,6 +18,7 @@ export enum ErrorCode {
     HostReturnedError = "host_returned_error",
     StorageReturnedTransientError = "storage_returned_transient_error",
     ContentContainsSpecifiedString = "content_contains_specified_string",
+    ContentMissingSpecifiedString = "content_missing_specified_string",
     TemporaryUnavailable = "temporary_unavailable",
     ResultingImageTooLarge = "resulting_image_too_large",
     InvalidCookieParameter = "invalid_cookie_parameter",
@@ -104,6 +105,15 @@ const allErrors: Record<ErrorCode, APIError> = {
         documentationUrl:
             "https://screenshotone.com/docs/errors/host-returned-error/",
     },
+    [ErrorCode.ContentMissingSpecifiedString]: {
+        httpStatusCode: 500,
+        title: "Content Missing Specified String",
+        code: "content_missing_specified_string",
+        description:
+            "The page content is missing the specified string by the `fail_if_content_missing` option. If it seems to be a mistake or not what you expected, please, reach out to `support@screenshotone.com` as quickly as possible, and will assist and try to resolve your problem.",
+        documentationUrl:
+            "https://screenshotone.com/docs/errors/content-missing-specified-string/",
+    },
     [ErrorCode.ContentContainsSpecifiedString]: {
         httpStatusCode: 500,
         title: "Content Contains Specified String",