diff --git a/ch06.asciidoc b/ch06.asciidoc
index 1103f930..065a1919 100644
--- a/ch06.asciidoc
+++ b/ch06.asciidoc
@@ -543,7 +543,7 @@ where:
 
 More details on the mathematics of ECDSA can be found in <<ecdsa_math>>.
 
-The function F~_sig_~ produces a signature +Sig+ that is composed of two values, commonly referred to as +R+ and +S+:
+The function _F_~_sig_~ produces a signature +Sig+ that is composed of two values, commonly referred to as +R+ and +S+:
 
 ----
 Sig = (R, S)
@@ -594,6 +594,7 @@ There are three +SIGHASH+ flags: +ALL+, +NONE+, and +SINGLE+, as shown in <<sigh
 
 [[sighash_types_and_their]]
 .SIGHASH types and their meanings
+[options="header"]
 |=======================
 |+SIGHASH+ flag| Value | Description
 | +ALL+ | 0x01 | Signature applies to all inputs and outputs
@@ -605,6 +606,7 @@ In addition, there is a modifier flag +SIGHASH_ANYONECANPAY+, which can be combi
 
 [[sighash_types_with_modifiers]]
 .SIGHASH types with modifiers and their meanings
+[options="header"]
 |=======================
 |SIGHASH flag| Value | Description
 | ALL\|ANYONECANPAY | 0x81 | Signature applies to one inputs and all outputs