runtime(doc):  clarify license conditions for distributed runtime files

related: #17372

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/uganda.txt b/runtime/doc/uganda.txt
index 17590e5..7f7a666 100644
--- a/runtime/doc/uganda.txt
+++ b/runtime/doc/uganda.txt
@@ -1,4 +1,4 @@
-*uganda.txt*    For Vim version 9.1.  Last change: 2024 Aug 14
+*uganda.txt*    For Vim version 9.1.  Last change: 2025 May 25
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -127,6 +127,9 @@
   contact information with the "--with-modified-by" configure argument or the
   MODIFIED_BY define.
 
+- This license applies to the source code of Vim.  However, different license
+  conditions may apply to some runtime files included with Vim; these will be
+  specified in the header of each respective file.
 ==============================================================================
 Kibaale Children's Centre		*kcc* *Kibaale*  *charity*