diff --git a/RMD_Digging manual V2.pdf b/RMD_Digging manual V2.pdf
new file mode 100644
index 0000000..c6be43f
Binary files /dev/null and b/RMD_Digging manual V2.pdf differ
diff --git a/species/MWevolution_new.m b/species/MWevolution_new.m
index 822830e..a73549d 100644
--- a/species/MWevolution_new.m
+++ b/species/MWevolution_new.m
@@ -44,8 +44,8 @@
                     STEP(i)=str2num(MWDfram{1,i});
                 end
             case 2
-                minstep=input('\nPlease input the minimum timestpe: \n');
-                maxstep=input('\nPlease input the maximum timestpe: \n');
+                minstep=input('\nPlease input the minimum timestep: \n');
+                maxstep=input('\nPlease input the maximum timestep: \n');
                 dumpevery=input('\nPlease input the output frequency of species file by lammps: \n');
                 STEP(1)=maxstep(1);STEP(2)=minstep(1);
                 MWDfram=input('\nPlease input the common difference of monotonically increasing frames, must be the integral multiple of output frequency of species file: \n');
diff --git a/species/species_capture.m b/species/species_capture.m
index 6ca0bde..5d2cc9a 100644
--- a/species/species_capture.m
+++ b/species/species_capture.m
@@ -8,7 +8,7 @@
 disp('References: 1.Fuel 287 (2021) 119484. 2.ACS Appl. Mat. Interfaces 13(34) (2021) 41287-41302. More work is coming!')
 disp('##################################################################################################################################')
 disp('When species_analysis is executed, this procedure can obtain the interested species')
-species=input('Please input the molecular formula, should be lin line with the species file, especially the element sequence, \nmultiple molecular formula can be seperated by white space: \n','s');
+species=input('Please input the molecular formula, should be lin line with the species file, especially the element sequence, \nmultiple molecular formulas can be seperated by white space: \n','s');
 species=upper(species);
 fprintf('\n\nspecies_capture is running, please wait...\n\n')
 species=strtrim(species);
diff --git a/species/statisave.m b/species/statisave_matrix.m
similarity index 97%
rename from species/statisave.m
rename to species/statisave_matrix.m
index eb86b71..5760ec7 100644
--- a/species/statisave.m
+++ b/species/statisave_matrix.m
@@ -7,6 +7,7 @@
 disp('Repository adress of the Source code on github: https://github.com/dadaoqiuzhi/RMD_Digging');
 disp('References: 1.Fuel 287 (2021) 119484. 2.ACS Appl. Mat. Interfaces 13(34) (2021) 41287-41302. More work is coming!')
 disp('##################################################################################################################################')
+fprintf('\nMatrix data is required\n');
 datasource=input('Where is the source data from: 1.Excel, 2.matrix in workspace. Input the No.: \n');
 if datasource==1
    datasource=xlsread('input_data.xlsx');
diff --git a/species/statistics.m b/species/statistics_cell.m
similarity index 98%
rename from species/statistics.m
rename to species/statistics_cell.m
index a780250..d404066 100644
--- a/species/statistics.m
+++ b/species/statistics_cell.m
@@ -7,6 +7,7 @@
 disp('Repository adress of the Source code on github: https://github.com/dadaoqiuzhi/RMD_Digging');
 disp('References: 1.Fuel 287 (2021) 119484. 2.ACS Appl. Mat. Interfaces 13(34) (2021) 41287-41302. More work is coming!')
 disp('##################################################################################################################################')
+fprintf('\nCell data is required\n');
 statans=input('Average data? y/n:\n','s');
 statans=lower(statans);
 if statans=='y'