diff --git a/default-treewalker-checks.xml b/default-treewalker-checks.xml
index 0ce93be..12b5044 100644
--- a/default-treewalker-checks.xml
+++ b/default-treewalker-checks.xml
@@ -52,16 +52,16 @@
 <!-- Non-public, non-static field names start with m. -->
 <module name="MemberName">
     <property name="severity" value="error"/>
-    <property name="format" value="^m[A-Z][a-zA-Z0-9]*$"/>
+    <property name="format" value="^m[A-Z0-9][a-zA-Z0-9]*$"/>
     <property name="applyToPublic" value="false"/>
-    <message key="name.invalidPattern" value="Non-public, non-static field names start with m."/>
+    <message key="name.invalidPattern" value="Non-public, non-static field names start with m and are camel-cased. (e.g. mSize)"/>
 </module>
 <!-- Static field names start with s. -->
 <module name="StaticVariableName">
     <property name="severity" value="error"/>
-    <property name="format" value="^s[A-Z][a-zA-Z0-9]*$"/>
+    <property name="format" value="^s[A-Z0-9][a-zA-Z0-9]*$"/>
     <property name="applyToPublic" value="false"/>
-    <message key="name.invalidPattern" value="Static field names start with s."/>
+    <message key="name.invalidPattern" value="Static field names start with s and are camel-cased. (e.g. sFooBar)"/>
 </module>
 <module name="MethodName">
     <property name="severity" value="error"/>