Always ensure JSDoc comments accurately reflect the actual code implementation. Parameter types, optionality, and function behavior must be precisely documented to prevent confusion and bugs. When documenting parameters: - Match the exact types accepted by the function - Indicate optional parameters appropriately - Verify documentation when code changes For example, if a function accepts multiple types or optional parameters: ```javascript /** * Process user input * * @param {String|Array} input - The input to process * @param {Object} [options] - Optional configuration object * @return {Boolean} Whether processing succeeded */ function process(input, options) { // implementation } ``` Incorrect or outdated JSDoc can mislead developers and lead to runtime errors. Always review JSDoc comments when changing function signatures or behavior to ensure documentation and implementation remain synchronized.