Note that including Python.h includes limits.h when available.

Doc/api/api.tex

@@ -74,8 +74,8 @@ API are included in your code by the following line:
 \end{verbatim}
 
 This implies inclusion of the following standard headers:
-\code{<stdio.h>}, \code{<string.h>}, \code{<errno.h>}, and
-\code{<stdlib.h>} (if available).
+\code{<stdio.h>}, \code{<string.h>}, \code{<errno.h>},
+\code{<limits.h>}, and \code{<stdlib.h>} (if available).
 
 All user visible names defined by Python.h (except those defined by
 the included standard headers) have one of the prefixes \samp{Py} or