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-rw-r--r--generic/tclStringObj.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/generic/tclStringObj.c b/generic/tclStringObj.c
index 86f0c62..67e86c5 100644
--- a/generic/tclStringObj.c
+++ b/generic/tclStringObj.c
@@ -1261,6 +1261,8 @@ Tcl_AppendUnicodeToObj(
* Side effects:
* The string rep of appendObjPtr is appended to the string
* representation of objPtr.
+ * IMPORTANT: This routine does not and MUST NOT shimmer appendObjPtr.
+ * Callers are counting on that.
*
*----------------------------------------------------------------------
*/