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-rw-r--r--src/Fl_Text_Display.cxx2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/Fl_Text_Display.cxx b/src/Fl_Text_Display.cxx
index f6c3f50c2..18bb0ed2e 100644
--- a/src/Fl_Text_Display.cxx
+++ b/src/Fl_Text_Display.cxx
@@ -331,6 +331,8 @@ Fl_Align Fl_Text_Display::linenumber_align() const {
An internal copy of \p val is allocated and managed;
it is automatically freed whenever a new value is assigned,
or when the widget is destroyed.
+
+ The value of \p val must \a not be NULL.
Example values: