diff --git a/src/b-st-ext.adoc b/src/b-st-ext.adoc
index 577037be4..c5352c24c 100644
--- a/src/b-st-ext.adoc
+++ b/src/b-st-ext.adoc
@@ -628,7 +628,7 @@ instructions that return the smaller/larger of two operands.
 
 These instructions perform the sign extension or zero extension of the least significant 8 bits or 16 bits of the source register.
 
-These instructions replace the generalized idioms `slli rD,rS,(XLEN-<size>) + srli` (for zero extension) or `slli + srai` (for sign extension) for the sign extension of 8-bit and 16-bit quantities, and for the zero extension of 16-bit quantities.
+These instructions replace the generalized idioms `slli rd,rs,(XLEN-<size>) + srai` (for sign extension of 8-bit and 16-bit quantities) and `slli + srli` (for zero extension of 16-bit quantities).
 
 [%header,cols="^1,^1,4,8"]
 |===