2 files changed, 20 insertions, 5 deletions
diff --git a/man/man3/strtol.3 b/man/man3/strtol.3
index 9323873a9d..f9c9af4bcb 100644
--- a/man/man3/strtol.3
+++ b/man/man3/strtol.3
@@ -224,6 +224,13 @@ if (errno == EINVAL)
     goto unsupported_base;
 .EE
 .in
+.SH BUGS
+.SS White space
+These functions silently accept leading white space.
+To reject white space, call
+.BR isspace (3)
+before
+.BR strtol ().
 .SH EXAMPLES
 The program shown below demonstrates the use of
 .BR strtol ().
diff --git a/man/man3/strtoul.3 b/man/man3/strtoul.3
index 9eb260dae4..c4f8961a4d 100644
--- a/man/man3/strtoul.3
+++ b/man/man3/strtoul.3
@@ -204,11 +204,19 @@ to 0 before the call,
 and then determine if an error occurred by checking whether
 .I errno
 has a nonzero value after the call.
-.P
-Negative values are considered valid input and are
-silently converted to the equivalent
-.I "unsigned long"
-value.
+.SH BUGS
+.SS Signed numbers
+Some negative values
+are considered valid input and
+are silently converted to
+.IR "\%unsigned\ long" .
+.SS White space
+These functions silently accept leading whitespace.
+.SS isalnum(3)
+To reject white space and/or a sign, call
+.BR isalnum (3)
+before
+.BR strtoul ().
 .SH EXAMPLES
 See the example on the
 .BR strtol (3)