diff --git a/ch04.asciidoc b/ch04.asciidoc
index ed007f72..3997ceac 100644
--- a/ch04.asciidoc
+++ b/ch04.asciidoc
@@ -578,9 +578,9 @@ BIP0039 defines the creation of a mnemonic code and seed as a follows:
 4. Divide the sequence into sections of 11 bits, using those to index a dictionary of 2048 predefined words.
 5. Produce 12 to 24 words representing the mnemonic code.
 
-Table 4-5 shows the relationship between the size of entropy data and the length of mnemonic codes in words.
-
+<<table_4-5>> shows the relationship between the size of entropy data and the length of mnemonic codes in words.
 
+[[table_4-5]]
 .Mnemonic codes: entropy and word length
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