Minor documentation updates

4 files changed, 13 insertions, 13 deletions

diff --git a/include/qpdf/QPDF.hh b/include/qpdf/QPDF.hh
index 941004cc..9926e87c 100644
--- a/include/qpdf/QPDF.hh
+++ b/include/qpdf/QPDF.hh
@@ -595,7 +595,7 @@ class QPDF
     // duplicated. For efficiency, this method returns a const
     // reference to an internal vector of pages. Calls to addPage,
     // addPageAt, and removePage safely update this, but directly
-    // manipulation of the pages three or pushing inheritable objects
+    // manipulation of the pages tree or pushing inheritable objects
     // to the page level may invalidate it. See comments for
     // updateAllPagesCache() for additional notes. Newer code should
     // use QPDFPageDocumentHelper::getAllPages instead. The decision
diff --git a/include/qpdf/QPDFObjectHandle.hh b/include/qpdf/QPDFObjectHandle.hh
index 2f2b3ebc..54f2eed3 100644
--- a/include/qpdf/QPDFObjectHandle.hh
+++ b/include/qpdf/QPDFObjectHandle.hh
@@ -320,7 +320,7 @@ class QPDFObjectHandle
     QPDF_DLL
     char const* getTypeName();
 
-    // Exactly one of these will return true for any object.  Operator
+    // Exactly one of these will return true for any initialized object.  Operator
     // and InlineImage are only allowed in content streams.
     QPDF_DLL
     bool isBool();
@@ -594,7 +594,7 @@ class QPDFObjectHandle
     static QPDFObjectHandle newReserved(QPDF* qpdf);
 
     // Provide an owning qpdf and object description. The library does
-    // this automatically with objects that are read from from the
+    // this automatically with objects that are read from the
     // input PDF and with objects that are created programmatically
     // and inserted into the QPDF by adding them to an array or a
     // dictionary or creating a new indirect object. Most end user
@@ -648,7 +648,7 @@ class QPDFObjectHandle
     // with PDF Doc Encoding. PDF Doc Encoding is identical to
     // ISO-8859-1 except in the range from 0200 through 0240, where
     // there is a mapping of characters to Unicode. QPDF versions
-    // prior to version erroneously left characters in that range
+    // prior to version 8.0.0 erroneously left characters in that range
     // unmapped.
     QPDF_DLL
     std::string getUTF8Value();
@@ -684,13 +684,13 @@ class QPDFObjectHandle
     std::vector<QPDFObjectHandle> getArrayAsVector();
     QPDF_DLL
     bool isRectangle();
-    // If the array an array of four numeric values, return as a
+    // If the array is an array of four numeric values, return as a
     // rectangle. Otherwise, return the rectangle [0, 0, 0, 0]
     QPDF_DLL
     Rectangle getArrayAsRectangle();
     QPDF_DLL
     bool isMatrix();
-    // If the array an array of six numeric values, return as a
+    // If the array is an array of six numeric values, return as a
     // matrix. Otherwise, return the matrix [1, 0, 0, 1, 0, 0]
     QPDF_DLL
     Matrix getArrayAsMatrix();
diff --git a/include/qpdf/QPDFPageDocumentHelper.hh b/include/qpdf/QPDFPageDocumentHelper.hh
index 867ddac0..93ae7677 100644
--- a/include/qpdf/QPDFPageDocumentHelper.hh
+++ b/include/qpdf/QPDFPageDocumentHelper.hh
@@ -46,11 +46,11 @@ class QPDFPageDocumentHelper: public QPDFDocumentHelper
 
     // Traverse page tree, and return all /Page objects wrapped in
     // QPDFPageObjectHelper objects. Unlike with
-    // QPDFObjectHandle::getAllPages, the vector of pages returned by
+    // QPDF::getAllPages, the vector of pages returned by
     // this call is not affected by additions or removals of pages. If
     // you manipulate pages, you will have to call this again to get a
-    // new copy. Please comments in QPDFObjectHandle.hh for
-    // getAllPages() for additional details.
+    // new copy. Please see comments in QPDF.hh for getAllPages() for
+    // additional details.
     QPDF_DLL
     std::vector<QPDFPageObjectHelper> getAllPages();
 
diff --git a/include/qpdf/qpdf-c.h b/include/qpdf/qpdf-c.h
index 94338837..0aa40092 100644
--- a/include/qpdf/qpdf-c.h
+++ b/include/qpdf/qpdf-c.h
@@ -502,7 +502,7 @@ extern "C" {
      * specific method of QPDFObjectHandler. For example,
      * qpdf_oh_is_bool corresponds to QPDFObjectHandle::isBool. If the
      * C++ method is overloaded, the C function's name will be
-     * disambiguated. If the C++ method takes optional argumens, the C
+     * disambiguated. If the C++ method takes optional arguments, the C
      * function will have required arguments in those positions. For
      * details about the method, please see comments in
      * QPDFObjectHandle.hh. Comments here only explain things that are
@@ -527,7 +527,7 @@ extern "C" {
      * expected to be valid after the next qpdf call.
      *
      * The qpdf_data object keeps a cache of handles returned by these
-     * functions. Once you are finished referencing an handle, you can
+     * functions. Once you are finished referencing a handle, you can
      * optionally release it. Releasing handles is optional since they
      * will all get released by qpdf_cleanup, but it can help to
      * reduce the memory footprint of the qpdf_data object to release
@@ -538,8 +538,8 @@ extern "C" {
      * add it to an existing dictionary or array, and then release it's
      * handle, the object is safely part of the dictionary or array.
      * Similarly, any other object handle refering to the object remains
-     * valid. Explicitly releasing an object is essentially the same as
-     * letting a QPDFObjectHandle go out of scope in the C++ API.
+     * valid. Explicitly releasing an object handle is essentially the
+     * same as letting a QPDFObjectHandle go out of scope in the C++ API.
      */
 
     /* For examples of using this API, see examples/pdf-c-objects.c */