diff --git a/readme.md b/readme.md
index c2bd3f2..c1ecdb3 100644
--- a/readme.md
+++ b/readme.md
@@ -550,11 +550,11 @@ is.all(is.string, '🦄', [], 'unicorns');
 
 ##### .validLength(value)
 
-Returns `true` if the value is a safe integer that is greater than or equal to zero
+Returns `true` if the value is a safe integer that is greater than or equal to zero.
 
 ##### .whitespaceString(value)
 
-Returns `true` if the value is a string with only whitespace characters
+Returns `true` if the value is a string with only whitespace characters.
 
 ## Type guards