diff --git a/README.md b/README.md
index 5c72440..53d5f20 100644
--- a/README.md
+++ b/README.md
@@ -19,8 +19,8 @@ README for XSLT_PEDS
   
   The following software is required or recommended for use with XSLT_PEDS:
   
-    - Xalan (listed in package managers as 'xalan-c', required)
-    - Xerces (listed in package managers as 'xerces-c', required)
+    - Xalan (may be listed in package managers as 'xalan-c', required)
+    - Xerces (may be listed in package managers as 'xerces-c', required)
     - unzip (required)
     - zenity (recommended)