diff --git a/README.md b/README.md
index 93f8451..94b73eb 100644
--- a/README.md
+++ b/README.md
@@ -11,14 +11,14 @@ This is a project (previously named as MPEG2DecPlus) to modify DGDecode.dll for
 ### Usage:
 
  ```
- D2VSource(string "d2v", int "idct", bool "showQ", int "info", int "upConv", bool "i420", bool "iCC")
+ D2VSource(string "d2v", int "idct", bool "showQ", int "info", int "upConv", bool "i420", bool "iCC", bool "nocrop", int "rff")
  ```
 
 ### Parameters:
 
 - d2v\
     The path of the dv2 file.
-    
+
 - idct\
     The iDCT algorithm to use.\
     0: Follow the d2v specification.\
@@ -26,11 +26,11 @@ This is a project (previously named as MPEG2DecPlus) to modify DGDecode.dll for
     4: SSE2/AVX2 LLM (single precision floating point, SSE2/AVX2 determination is automatic).\
     5: IEEE 1180 reference (double precision floating point).\
     Default: -1.
-    
+
 - showQ\
     It displays macroblock quantizers..\
     Default: False.
-    
+
 - info\
     It prints debug information.\
     0: Do not display.\
@@ -38,30 +38,120 @@ This is a project (previously named as MPEG2DecPlus) to modify DGDecode.dll for
     2: Output with OutputDebugString(). (The contents are confirmed by DebugView.exe).\
     3: Embed hints in 64 bytes of the frame upper left corner.\
     Default: 0.
-    
+
 - upConv\
     The output format.\
     0: No conversion. YUV420 output is YV12, YUV422 output is YV16.\
     1: Output YV16.\
     2: Output YV24.\
     Default: 0.
-    
+
 - i420\
     It determinates what is the output of YUV420.\
     True: The output is i410.\
     False: The output is YV12.\
     Default: False.
-    
+
 - iCC\
     It determinates how YUV420 is upscaled when upConv=true.\
     True: Force field-based upsampling.\
     False: Forse progressive upsampling.\
     Default: Auto determination based on the frame flag.
-    
+
+- nocrop\
+    Use direct-rendered buffer, which may need cropping.\
+    It could provide a speedup when you know you need to crop your image anyway, by avoiding extra memcpy calls.\
+    Default: False.
+
+- rff\
+    Changes Field_Operation without the need of editing d2v or rescanning with different Field Operation.\
+    0: Honor Pulldowns Flags.\
+    1: Forced Film.\
+    2: Ignored Pulldowns Flags.\
+    Default: -1 - read the value from d2v.
+
 ### Exported variables:
 
 FFSAR_NUM, FFSAR_DEN, FFSAR.
 
+### Frame properties
+
+_AbsoluteTime [float]\
+The frame’s absolute timestamp in seconds.
+
+_AspectRatio [data]\
+A string giving the display aspect ratio.
+
+_ChromaLocation [int]\
+Chroma sample position in YUV formats:
+0=left, 1=center, 2=topleft, 3=top, 4=bottomleft, 5=bottom.
+
+_DurationNum [int], _DurationDen [int]\
+The frame’s duration in seconds as a rational number.
+
+_EncodedFrameTop [int], _EncodedFrameBottom [int]\
+Frame number (before pulldown) used to generate this frame's
+top/bottom field.
+
+_FieldBased [int]\
+Describes the composition of the frame:\
+0=frame based (progressive), 1=bottom field first, 2=top field first.\
+Note that the GOP progressive flag is used to determine whether the frame is progressive.
+
+_FieldOperation [int]\
+Describes the field operation option in effect:\
+0=honor pulldown, 1=force film, 2=ignore pulldown.
+
+_FieldOrder [int]\
+Display field order of the frame:\
+0=bottom field first, 1=top field first.
+
+_Film [int]\
+Set if the frame is part of a 3:2 soft pulldown section.\
+Note that this uses the RFF history of several preceding\
+frames, and so is valid only when doing linear access.
+
+_GOPClosed [int]\
+Set if the current GOP is closed.
+
+_GOPNumber [int]\
+The 0-based GOP number that contains the frame. Note that\
+if this is set as the value x, then propShow displays it as\
+[x, y] where y is the 0-based frame number of the first frame\
+in the GOP.
+
+_GOPPosition [int]\
+The GOP position field from the D2V file for the GOP containing\
+the frame.
+
+_Matrix [int]\
+The matrix number field from the D2V file for the GOP containing\
+the frame.
+
+_PictType [data]\
+A single character describing the frame type. It uses the common\
+IPB characters but others may also be used for formats with\
+additional frame types.
+
+_ProgressiveFrame [int]\
+Set if the progress_frame flag is set for this frame.
+
+_QuantsAverage [int]\
+The average quantizer value for the frame.
+
+_QuantsMax [int]\
+The maximum quantizer value for the frame.
+
+_QuantsMin [int]\
+The minimum quantizer value for the frame.
+
+_RFF [int]\
+If _FieldOperation is 2 (ignore pulldown) then _RFF describes whether the stream specifies that a repeat field operation is to be performed on this frame. If _FieldOperation is 0 (honor pulldown) or 1 (force film) then _RFF describes whether the frame was composed with field repetition.
+
+_TFF [int]\
+If _FieldOperation is 2 (ignore pulldown) and _RFF is set, then _TFF\
+describes whether the stream specifies that the top field is to be repeated, otherwise the bottom field is to be repeated. If _FieldOperation is 0 (honor pulldown) or 1 (force film) then _TFF is inapplicable and is set to -1.
+
 ### Building:
 
 - Windows\
@@ -79,7 +169,7 @@ FFSAR_NUM, FFSAR_DEN, FFSAR.
     cd MPEG2DecPlus && \
     mkdir build && \
     cd build && \
-    
+
     cmake ..
     make -j$(nproc)
     sudo make install