Comment the limitation and reason

src/pager.c

@@ -1060,6 +1060,8 @@ coord *click_cc;
         case '?':
             from_screen = FALSE;
             getlin("Specify what? (type the word)", out_str);
+            /* mungspaces prevents querying for a space glyph (eg. a ghost),
+               but players almost always use '/' instead to look up glyphs */
             mungspaces(out_str);
             if (out_str[0] == '\0' || out_str[0] == '\033')
                 return 0;