Minor documentation improvement.
diff --git a/include/freetype/ftglyph.h b/include/freetype/ftglyph.h
index 2c6249c..26f78cd 100644
--- a/include/freetype/ftglyph.h
+++ b/include/freetype/ftglyph.h
@@ -219,7 +219,8 @@ FT_BEGIN_HEADER
/* FT_Get_Glyph */
/* */
/* <Description> */
- /* A function used to extract a glyph image from a slot. */
+ /* A function used to extract a glyph image from a slot. Note that */
+ /* the created @FT_Glyph object must be released with @FT_Done_Glyph. */
/* */
/* <Input> */
/* slot :: A handle to the source glyph slot. */