diff --git a/manuscript/chapter8.txt b/manuscript/chapter8.txt
index c91a83f..acd7f21 100644
--- a/manuscript/chapter8.txt
+++ b/manuscript/chapter8.txt
@@ -54,12 +54,12 @@
 
 | Parameter | What does it do? |
 | --------- | ---------------- |
-| `${VAR:-STRING}` | If `VAR` is empty or unset, use `STRING` as it's value.
-| `${VAR-STRING}` | If `VAR` is unset, use `STRING` as it's value.
+| `${VAR:-STRING}` | If `VAR` is empty or unset, use `STRING` as its value.
+| `${VAR-STRING}` | If `VAR` is unset, use `STRING` as its value.
 | `${VAR:=STRING}` | If `VAR` is empty or unset, set the value of `VAR` to `STRING`.
 | `${VAR=STRING}` | If `VAR` is unset, set the value of `VAR` to `STRING`.
-| `${VAR:+STRING}` | If `VAR` is not empty, use `STRING` as it's value.
-| `${VAR+STRING}` | If `VAR` is set, use `STRING` as it's value.
+| `${VAR:+STRING}` | If `VAR` is not empty, use `STRING` as its value.
+| `${VAR+STRING}` | If `VAR` is set, use `STRING` as its value.
 | `${VAR:?STRING}` | Display an error if empty or unset.
 | `${VAR?STRING}` | Display an error if unset.