diff --git a/reference/info/functions/version-compare.xml b/reference/info/functions/version-compare.xml
index f5b92217f5..ad49b5b4c2 100644
--- a/reference/info/functions/version-compare.xml
+++ b/reference/info/functions/version-compare.xml
@@ -145,6 +145,15 @@ if (version_compare(PHP_VERSION, '5.0.0', '<')) {
lower than their final release counterparts (like 5.3.0).
+
+
+ Special version strings such as alpha and
+ beta are case sensitive. Version strings from arbitrary
+ sources that do not adhere to the PHP standard may need to be lowercased
+ via strtolower before calling
+ version_compare.
+
+