diff --git a/.vale/fixtures/RedHat/CaseSensitiveTerms/testinvalid.adoc b/.vale/fixtures/RedHat/CaseSensitiveTerms/testinvalid.adoc
index 514d62bc..17d2a1ee 100644
--- a/.vale/fixtures/RedHat/CaseSensitiveTerms/testinvalid.adoc
+++ b/.vale/fixtures/RedHat/CaseSensitiveTerms/testinvalid.adoc
@@ -451,7 +451,6 @@ Smart State
 smart state
 Smart state
 Smart-NIC
-Smartstate
 Smartstate Analysis
 socks
 SoftIRQ
@@ -555,3 +554,9 @@ xplat-cli
 XPLAT-CLI
 Xterm
 Yaml is not a markup language.
+Y-Stream
+Y Stream
+Y stream
+Z-Stream
+Z Stream
+Z stream
diff --git a/.vale/fixtures/RedHat/CaseSensitiveTerms/testvalid.adoc b/.vale/fixtures/RedHat/CaseSensitiveTerms/testvalid.adoc
index 66196053..0653094f 100644
--- a/.vale/fixtures/RedHat/CaseSensitiveTerms/testvalid.adoc
+++ b/.vale/fixtures/RedHat/CaseSensitiveTerms/testvalid.adoc
@@ -342,3 +342,5 @@ XP
 xterm
 YAML
 yaml-patch
+y-stream
+z-stream
diff --git a/.vale/styles/RedHat/CaseSensitiveTerms.yml b/.vale/styles/RedHat/CaseSensitiveTerms.yml
index 5e088182..3e451ff0 100644
--- a/.vale/styles/RedHat/CaseSensitiveTerms.yml
+++ b/.vale/styles/RedHat/CaseSensitiveTerms.yml
@@ -323,3 +323,5 @@ swap:
   xplat-cli|x-plat-cli|xplat cli|x-plat cli|X-PLAT CLI|X-PLAT-CLI|XPLAT-CLI|XPLAT CLI: Microsoft Azure Cross-Platform Command-Line Interface
   Xp|xp: XP
   Xterm: xterm
+  Y-Stream|Y [Ss]?tream: y-stream
+  Z-Stream|Z [Ss]?tream: z-stream