diff --git a/google/cloud/texttospeech_v1/services/text_to_speech/client.py b/google/cloud/texttospeech_v1/services/text_to_speech/client.py
index dadad936..b87cc114 100644
--- a/google/cloud/texttospeech_v1/services/text_to_speech/client.py
+++ b/google/cloud/texttospeech_v1/services/text_to_speech/client.py
@@ -228,11 +228,11 @@ def list_voices(
                 language tag. If specified, the ListVoices call will
                 only return voices that can be used to synthesize this
                 language_code. E.g. when specifying "en-NZ", you will
-                get supported "en-*" voices; when specifying "no", you
-                will get supported "no-*" (Norwegian) and "nb-*"
+                get supported "en-\*" voices; when specifying "no", you
+                will get supported "no-\*" (Norwegian) and "nb-*"
                 (Norwegian Bokmal) voices; specifying "zh" will also get
                 supported "cmn-*" voices; specifying "zh-hk" will also
-                get supported "yue-*" voices.
+                get supported "yue-\*" voices.
                 This corresponds to the ``language_code`` field
                 on the ``request`` instance; if ``request`` is provided, this
                 should not be set.
diff --git a/google/cloud/texttospeech_v1beta1/services/text_to_speech/client.py b/google/cloud/texttospeech_v1beta1/services/text_to_speech/client.py
index 776bcac6..f885936b 100644
--- a/google/cloud/texttospeech_v1beta1/services/text_to_speech/client.py
+++ b/google/cloud/texttospeech_v1beta1/services/text_to_speech/client.py
@@ -228,11 +228,11 @@ def list_voices(
                 language tag. If specified, the ListVoices call will
                 only return voices that can be used to synthesize this
                 language_code. E.g. when specifying "en-NZ", you will
-                get supported "en-*" voices; when specifying "no", you
-                will get supported "no-*" (Norwegian) and "nb-*"
+                get supported "en-\*" voices; when specifying "no", you
+                will get supported "no-\*" (Norwegian) and "nb-*"
                 (Norwegian Bokmal) voices; specifying "zh" will also get
                 supported "cmn-*" voices; specifying "zh-hk" will also
-                get supported "yue-*" voices.
+                get supported "yue-\*" voices.
                 This corresponds to the ``language_code`` field
                 on the ``request`` instance; if ``request`` is provided, this
                 should not be set.
diff --git a/synth.py b/synth.py
index a6f6ba14..de6f4c92 100644
--- a/synth.py
+++ b/synth.py
@@ -32,7 +32,7 @@
 
 # Sphinx interprets `*` as emphasis
 s.replace(
-    ["google/cloud/**/*_client.py", "google/cloud/**/cloud_tts.py"],
+    ["google/cloud/**/client.py", "google/cloud/**/cloud_tts.py"],
     "((en)|(no)|(nb)(cmn)|(yue))-\*",
     "\g<1>-\*",
 )