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-rw-r--r--runtime/doc/builtin.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 96db898b03..2f6961d7dc 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -10347,6 +10347,9 @@ virtcol2col({winid}, {lnum}, {col}) *virtcol2col()*
{lnum}, then the byte index of the character at the last
virtual column is returned.
+ For a multi-byte character, the column number of the first
+ byte in the character is returned.
+
The {winid} argument can be the window number or the
|window-ID|. If this is zero, then the current window is used.