diff --git a/ares/ares_expand_string.3 b/ares/ares_expand_string.3
index 6f501885e..872e677f7 100644
--- a/ares/ares_expand_string.3
+++ b/ares/ares_expand_string.3
@@ -28,7 +28,7 @@ ares_expand_string \- Expand a length encoded string
 .SH DESCRIPTION
 The
 .B ares_expand_string
-function converts a length encoded string to a NULL terminated C
+function converts a length encoded string to a NUL-terminated C
 string.  The argument
 .I encoded
 gives the beginning of the encoded string, and the arguments
diff --git a/docs/libcurl/curl_easy_setopt.3 b/docs/libcurl/curl_easy_setopt.3
index b5a0b270e..8bdcf2172 100644
--- a/docs/libcurl/curl_easy_setopt.3
+++ b/docs/libcurl/curl_easy_setopt.3
@@ -727,18 +727,19 @@ data to figure out the size. This is the large file version of the
 \fICURLOPT_POSTFIELDSIZE\fP option. (Added in 7.11.1)
 .IP CURLOPT_COPYPOSTFIELDS
 Pass a char * as parameter, which should be the full data to post in an HTTP
-POST operation. It behaves has the \fICURLOPT_POSTFIELDS\fP option, but the
+POST operation. It behaves as the \fICURLOPT_POSTFIELDS\fP option, but the
 original data are copied by the library, allowing the application to overwrite
 the original data after setting this option.
 
 Because data are copied, care must be taken when using this option in
 conjunction with \fICURLOPT_POSTFIELDSIZE\fP or
 \fICURLOPT_POSTFIELDSIZE_LARGE\fP: If the size has not been set prior to
-\fICURLOPT_COPYPOSTFIELDS\fP, the data are assumed to be a null-terminated
+\fICURLOPT_COPYPOSTFIELDS\fP, the data are assumed to be a NUL-terminated
 string; else the stored size informs the library about the data byte count to
 copy. In any case, the size must not be changed after
 \fICURLOPT_COPYPOSTFIELDS\fP, unless another \fICURLOPT_POSTFIELDS\fP or
 \fICURLOPT_COPYPOSTFIELDS\fP option is issued.
+(Added in 7.17.1)
 
 .IP CURLOPT_HTTPPOST
 Tells libcurl you want a multipart/formdata HTTP POST to be made and you
diff --git a/docs/libcurl/curl_formadd.3 b/docs/libcurl/curl_formadd.3
index a94dd506f..8508dd411 100644
--- a/docs/libcurl/curl_formadd.3
+++ b/docs/libcurl/curl_formadd.3
@@ -44,7 +44,7 @@ parts.
 .IP CURLFORM_COPYNAME
 followed by a string which provides the \fIname\fP of this part. libcurl
 copies the string so your application doesn't need to keep it around after
-this function call. If the name isn't null terminated, or if you'd
+this function call. If the name isn't NUL-terminated, or if you'd
 like it to contain zero bytes, you must set its length with
 \fBCURLFORM_NAMELENGTH\fP. The copied data will be freed by
 \fIcurl_formfree(3)\fP.
@@ -53,7 +53,7 @@ like it to contain zero bytes, you must set its length with
 followed by a string which provides the \fIname\fP of this part. libcurl
 will use the pointer and refer to the data in your application, so you
 must make sure it remains until curl no longer needs it. If the name
-isn't null terminated, or if you'd like it to contain zero
+isn't NUL-terminated, or if you'd like it to contain zero
 bytes, you must set its length with \fBCURLFORM_NAMELENGTH\fP.
 
 .IP CURLFORM_COPYCONTENTS
@@ -68,7 +68,7 @@ data will be freed by \fIcurl_formfree(3)\fP.
 followed by a pointer to the contents of this part, the actual data
 to send away. libcurl will use the pointer and refer to the data in your
 application, so you must make sure it remains until curl no longer needs it.
-If the data isn't null terminated, or if you'd like it to contain zero bytes,
+If the data isn't NUL-terminated, or if you'd like it to contain zero bytes,
 you must set its length  with \fBCURLFORM_CONTENTSLENGTH\fP.
 
 .IP CURLFORM_CONTENTSLENGTH