docs: link to space reference
@@ -115,7 +115,9 @@ use syn::parse_macro_input;
/// for accounts owned by anchor programs.<br>
/// The given space number is the size of the account in bytes, so accounts that hold
/// a variable number of items such as a <code>Vec</code> should allocate sufficient space for all items that may
-/// be added to the data structure because account size is fixed. Check out the <a href = "https://borsh.io/" target = "_blank" rel = "noopener noreferrer">borsh library</a>
+/// be added to the data structure because account size is fixed.
+/// Check out the <a href = "https://book.anchor-lang.com/chapter_5/space.html" target = "_blank" rel = "noopener noreferrer">space reference</a>
+/// and the <a href = "https://borsh.io/" target = "_blank" rel = "noopener noreferrer">borsh library</a>
/// (which anchor uses under the hood for serialization) specification to learn how much
/// space different data structures require.
/// </li>
