diff --git a/src/routes/postSkipSegments.ts b/src/routes/postSkipSegments.ts
index 2065d35..dde758f 100644
--- a/src/routes/postSkipSegments.ts
+++ b/src/routes/postSkipSegments.ts
@@ -338,11 +338,13 @@ export async function postSkipSegments(req: Request, res: Response): Promise<Res
     });
 
     const invalidFields = [];
+    const errors = [];
     if (typeof videoID !== 'string') {
       invalidFields.push('videoID');
     }
     if (typeof userID !== 'string' || userID.length < 30) {
       invalidFields.push('userID');
+      if (userID.length < 30) errors.push(`userID must be at least 30 characters long`);
     }
     if (!Array.isArray(segments) || segments.length < 1) {
       invalidFields.push('segments');
@@ -350,8 +352,9 @@ export async function postSkipSegments(req: Request, res: Response): Promise<Res
 
     if (invalidFields.length !== 0) {
       // invalid request
-      const fields = invalidFields.reduce((p, c, i) => p + (i !== 0 ? ', ' : '') + c, '');
-      return res.status(400).send(`No valid ${fields} field(s) provided`);
+      const formattedFields = invalidFields.reduce((p, c, i) => p + (i !== 0 ? ', ' : '') + c, '');
+      const formattedErrors = errors.reduce((p, c, i) => p + (i !== 0 ? '. ' : ' ') + c, '');
+      return res.status(400).send(`No valid ${formattedFields} field(s) provided.${formattedErrors}`);
     }
 
     //hash the userID