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diff --git a/pod/perlapi.pod b/pod/perlapi.pod
index 36e50cb..93d1cfb 100644
--- a/pod/perlapi.pod
+++ b/pod/perlapi.pod
@@ -687,7 +687,7 @@ Found in file perl.c
 
 Tells Perl to C<require> the file named by the string argument.  It is
 analogous to the Perl code C<eval "require '$file'">.  It's even
-implemented that way; consider using Perl_load_module instead.
+implemented that way; consider using load_module instead.
 
 NOTE: the perl_ form of this function is deprecated.
 
@@ -704,19 +704,39 @@ Found in file perl.c
 
 =over 8
 
-=item pack_cat
+=item packlist
 
 The engine implementing pack() Perl function.
 
+	void	packlist(SV *cat, char *pat, char *patend, SV **beglist, SV **endlist)
+
+=for hackers
+Found in file pp_pack.c
+
+=item pack_cat
+
+The engine implementing pack() Perl function. Note: parameters next_in_list and
+flags are not used. This call should not be used; use packlist instead.
+
 	void	pack_cat(SV *cat, char *pat, char *patend, SV **beglist, SV **endlist, SV ***next_in_list, U32 flags)
 
 =for hackers
 Found in file pp_pack.c
 
-=item unpack_str
+=item unpackstring
 
 The engine implementing unpack() Perl function.
 
+	I32	unpackstring(char *pat, char *patend, char *s, char *strend, U32 flags)
+
+=for hackers
+Found in file pp_pack.c
+
+=item unpack_str
+
+The engine implementing unpack() Perl function. Note: parameters strbeg, new_s
+and ocnt are not used. This call should not be used, use unpackstring instead.
+
 	I32	unpack_str(char *pat, char *patend, char *s, char *strbeg, char *strend, char **new_s, I32 ocnt, U32 flags)
 
 =for hackers
@@ -915,6 +935,7 @@ Found in file hv.h
 =item Nullch
 
 Null character pointer.
+
 =for hackers
 Found in file handy.h
 
@@ -2740,6 +2761,27 @@ Returns a boolean indicating whether the SV contains an unsigned integer.
 =for hackers
 Found in file sv.h
 
+=item SvIsCOW
+
+Returns a boolean indicating whether the SV is Copy-On-Write. (either shared
+hash key scalars, or full Copy On Write scalars if 5.9.0 is configured for
+COW)
+
+	bool	SvIsCOW(SV* sv)
+
+=for hackers
+Found in file sv.h
+
+=item SvIsCOW_shared_hash
+
+Returns a boolean indicating whether the SV is Copy-On-Write shared hash key
+scalar.
+
+	bool	SvIsCOW_shared_hash(SV* sv)
+
+=for hackers
+Found in file sv.h
+
 =item SvIV
 
 Coerces the given SV to an integer and returns it. See  C<SvIVx> for a
@@ -2991,7 +3033,6 @@ Like C<SvPV>, but converts sv to byte representation first if necessary.
 Guarantees to evaluate sv only once; use the more efficient C<SvPVbyte>
 otherwise.
 
-
 	char*	SvPVbytex(SV* sv, STRLEN len)
 
 =for hackers
@@ -3640,6 +3681,8 @@ Efficient removal of characters from the beginning of the string buffer.
 SvPOK(sv) must be true and the C<ptr> must be a pointer to somewhere inside
 the string buffer.  The C<ptr> becomes the first character of the adjusted
 string. Uses the "OOK hack".
+Beware: after this function returns, C<ptr> and SvPVX(sv) may no longer
+refer to the same chunk of data.
 
 	void	sv_chop(SV* sv, char* ptr)
 
@@ -4237,6 +4280,25 @@ Like C<sv_setpvf>, but also handles 'set' magic.
 =for hackers
 Found in file sv.c
 
+=item sv_setpviv
+
+Copies an integer into the given SV, also updating its string value.
+Does not handle 'set' magic.  See C<sv_setpviv_mg>.
+
+	void	sv_setpviv(SV* sv, IV num)
+
+=for hackers
+Found in file sv.c
+
+=item sv_setpviv_mg
+
+Like C<sv_setpviv>, but also handles 'set' magic.
+
+	void	sv_setpviv_mg(SV *sv, IV iv)
+
+=for hackers
+Found in file sv.c
+
 =item sv_setpvn
 
 Copies a string into an SV.  The C<len> parameter indicates the number of
@@ -4708,6 +4770,9 @@ Converts a string C<s> of length C<len> from ASCII into UTF8 encoding.
 Returns a pointer to the newly-created string, and sets C<len> to
 reflect the new length.
 
+If you want to convert to UTF8 from other encodings than ASCII,
+see sv_recode_to_utf8().
+
 NOTE: this function is experimental and may change or be
 removed without notice.
 
@@ -4758,10 +4823,10 @@ Found in file utf8.c
 
 =item is_utf8_string
 
-Returns true if first C<len> bytes of the given string form a valid UTF8
-string, false otherwise.  Note that 'a valid UTF8 string' does not mean
-'a string that contains UTF8' because a valid ASCII string is a valid
-UTF8 string.
+Returns true if first C<len> bytes of the given string form a valid
+UTF8 string, false otherwise.  Note that 'a valid UTF8 string' does
+not mean 'a string that contains code points above 0x7F encoded in
+UTF8' because a valid ASCII string is a valid UTF8 string.
 
 	bool	is_utf8_string(U8 *s, STRLEN len)