diff --git a/Doc/library/curses.ascii.rst b/Doc/library/curses.ascii.rst
index f3661d9..db3c827 100644
--- a/Doc/library/curses.ascii.rst
+++ b/Doc/library/curses.ascii.rst
@@ -115,12 +115,12 @@
 
 .. function:: isblank(c)
 
-   Checks for an ASCII whitespace character.
+   Checks for an ASCII whitespace character; space or horizontal tab.
 
 
 .. function:: iscntrl(c)
 
-   Checks for an ASCII control character (in the range 0x00 to 0x1f).
+   Checks for an ASCII control character (in the range 0x00 to 0x1f or 0x7f).
 
 
 .. function:: isdigit(c)