docs: Document "Unsupported source encoding" statistics counter

diff --git a/doc/MANUAL.adoc b/doc/MANUAL.adoc
index d304d71966169f13be09c4ca25fb4dbb6bfe66e7..e84142be24c0eb072387b7f3f31a0b581c6c18b8 100644 (file)
--- a/doc/MANUAL.adoc
+++ b/doc/MANUAL.adoc
@@ -1540,6 +1540,10 @@ A compiler option not supported by ccache was found.
 | Unsupported environment variable |
 An environment variable not supported by ccache was set.
 
+| Unsupported source encoding |
+Source file (or an included header) has unsupported encoding. ccache currently
+requires UTF-8-encoded source code for MSVC.
+
 | Unsupported source language |
 A source language e.g. specified with `-x` was unsupported by ccache.